The DOI matches its Crossref record; 259 of the 259 references it cites were found in a registry or an index; 26 of the 376 sources its claims cite were checked for support.
Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate
Open accessAbstract
Ultraviolet (UV) radiation drives the net production of tropospheric ozone (O 3) and a large fraction of particulate matter (PM) including sulfate, nitrate, and secondary organic aerosols. Ground-level O 3 and PM are detrimental to human health, leading to several million premature deaths per year globally, and have adverse effects on plants and the yields of crops. The Montreal Protocol has prevented large increases in UV radiation that would have had major impacts on air quality. Future scenarios in which stratospheric O 3 returns to 1980 values or even exceeds them (the so-called super-recovery) will tend to ameliorate urban ground-level O 3 slightly but worsen it in rural areas. Furthermore, recovery of stratospheric O 3 is expected to increase the amount of O 3 transported into the troposphere by meteorological processes that are sensitive to climate change. UV radiation also generates hydroxyl radicals (OH) that control the amounts of many environmentally important chemicals in the atmosphere including some greenhouse gases, e.g., methane (CH 4), and some short-lived ozone-depleting substances (ODSs). Recent modeling studies have shown that the increases in UV radiation associated with the depletion of stratospheric ozone over 1980–2020 have contributed a small increase (~ 3%) to the globally averaged concentrations of OH. Replacements for ODSs include chemicals that react with OH radicals, hence preventing the transport of these chemicals to the stratosphere. Some of these chemicals, e.g., hydrofluorocarbons that are currently being phased out, and hydrofluoroolefins now used increasingly, decompose into products whose fate in the environment warrants further investigation. One such product, trifluoroacetic acid (TFA), has no obvious pathway of degradation and might accumulate in some water bodies, but is unlikely to cause adverse effects out to 2100. Graphical abstract
Overview
AI snapshot
Written from the paper’s full text.
TL;DR
This assessment reviews how stratospheric ozone protection and climate change alter tropospheric air quality, especially UV-driven ozone, particulate matter, OH, and trifluoroacetic acid (TFA). It concludes that the Montreal Protocol has avoided large UV increases, ozone recovery may slightly improve urban O3 but worsen rural O3, and projected TFA risks remain de minimis.
Key findings
- Recovery of stratospheric O3 to 1980 levels is estimated to increase the U.S. O3 column by 4–6% and to lower ambient O3 over a few large urban areas while raising it slightly elsewhere; under super-recovery by 2100, stratospheric O3 could increase by an additional 10% above 1980 levels under high emission scenarios, decreasing tropospheric JO3 by about 14%, with changes about three times greater than for recovery to 1980 levels.
- UV-B drives OH; modeling studies show increases in UV from stratospheric ozone depletion over 1980–2020 contributed a small increase (~3%) to globally averaged OH, while three Earth System Models gave a net OH increase of about 8% over 1980–2010, with rising CH4 counteracting by about −8%.
- Health: WHO estimates 4.2 million deaths/year from ambient air pollution; in ELAPSE, among 325,367 adults, each 5 µg/m3 increase in PM2.5 was associated with a 13% (95% CI 10.6–15.5%) increase in natural deaths, and below the U.S. 12 µg/m3 standard with nearly 30% (29.6%, 95% CI 14–47.4%) increase.
- TFA: projected deposition from HFC-134a and HFO-1234yf is 31.5–51.9 Tg for 2020–2100, raising ocean TFA sodium salt to 266–284 ng/L by 2100; margins of exposure are thousand-fold versus toxicity thresholds, and TFA is judged de minimis risk. U.S. pesticide use 1992–2018 was estimated to potentially release 122,604 tons TFA under worst-case assumptions.
Methods
- Design: quadrennial assessment/review in two parts: (1) effects of stratospheric O3 depletion, UV-B, and climate change on tropospheric air quality and health/ecosystems; (2) sources, fate, and risks of TFA.
- Data: literature searched through PubMed, Google Scholar, ScienceDirect, and relevant journals for peer-reviewed papers from 2018–2022, plus reports from international agencies (e.g., WHO) and government agencies (e.g., US EPA); papers/reports critically evaluated before inclusion.
- Analysis: synthesis of observations and numerical model results; includes new calculations/estimates, e.g., worst-case TFA tonnage from U.S. pesticide use using USGS data and molar yields.
Limitations
- Stated: major uncertainties remain for future emissions scenarios and environmental conditions (UV-B, temperature, humidity); models need improvement for urban VOC-NOx O3 chemistry, SOA formation, and stratospheric–tropospheric O3 exchange; global OH concentrations and variability need better constraints.
- Stated: TFA source identification/quantification, especially natural sources and short-lived precursor inventories, is uncertain; TFA toxicity data are limited because only two marine species are included and marine macrophytes have not been tested.
- Evident: as a review/assessment, conclusions depend on cited studies and model outputs rather than new primary measurements; many reported quantities have wide ranges or model disagreement (e.g., stratospheric–tropospheric exchange estimates vary from 347 ± 12 to 628 ± 800 Tg/year).
Model-written summary. Check it against the paper before relying on it.
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Statistics
Figures


![Fig. 2 Global tropospheric ozone (Tg) estimated by multi-model assessments (MMM, ACCMIP, TOAR) and observations (OBS, for the year 2000). Future projections are for one Shared Socioeconomic Pathway (SSP370 scenario). From IPCC 2021 Ch. 6 [11]](/paper-figures/dd70111732f04937b0be35aa979224d4/changes-in-tropospheric-air-quality-related-to-the-protection-of-stratospheric-figure-2.jpg)
![Fig. 3 Regional and local trends in tropospheric ozone at the surface and lower atmosphere. From IPCC 2021 Ch. 6 [11]](/paper-figures/74ddfa427d224e2a88386136542e70bb/changes-in-tropospheric-air-quality-related-to-the-protection-of-stratospheric-figure-3.jpg)


![Fig. 4 Composition of PM2.5 over the contiguous United States calculated with a chemistry-transport model. Particles produced by UV photochemical reactions (secondary aerosols) include sulfate (SO4), ammonium nitrate (NH4NO3) and secondary organic aerosols (SOA) from anthropogenic or biogenic precursors (SOAAVOC and SOABVOC, respectively), and account for more than half of the total PM2.5, compared to directly emitted particles (primary aerosols) such as dust, soot, and sea spray. VOC, volatile organic compounds. From Pye et al. [46]](/paper-figures/8c80f171a9df4c5e8e4161fae0b78061/changes-in-tropospheric-air-quality-related-to-the-protection-of-stratospheric-figure-4.jpg)
![Fig. 5 Sites at which air pollution can affect interactions mediated by olfactory or visual cues between plants and their associated community. A Effects of pollutants on signal-emitting organisms. B The degradation of VOCs by air pollutants and formation of reaction products and secondary organic aerosol (SOA). C Effects on the signal receiving organisms, e.g., pollinating insects. In addition, exposure to air pollution can influence the interactions between herbivores and plants. D From [134], reproduced with permission](/paper-figures/52e351a53b1f42c9b527c43e40fc4db1/changes-in-tropospheric-air-quality-related-to-the-protection-of-stratospheric-figure-5.jpg)
![Fig. 6 Relative change in global concentrations of tropospheric OH from 1980 to 2020, estimated with three different Earth System Models (ESMs). The net change in OH (rightmost column) has contributions from increased emissions of nitrogen oxides and other precursors of tropospheric ozone (ΔNOx); increased emissions of methane (ΔCH4); accumulation of ozone-depleting substances now regulated under the Montreal Protocol (ΔODSs); emissions of particulate matter and its precursors (ΔPM); and other undifferentiated changes attributed to underlying climate change (e.g., water vapor), as well as interactions among these separate factors (ΔOther) (modified from [141])](/paper-figures/d10ac61d1a754c60b62f2d17bae6b8ff/changes-in-tropospheric-air-quality-related-to-the-protection-of-stratospheric-figure-6.jpg)


![Fig. 9 Drivers of tropospheric ozone concentration (redrawn with permission and assistance from Guang Zeng from Fig. 13, in [158]). The deposition amount is directly related to the concentration of O3 at the surface of the Earth. The two panels represent the output of different chemistry–climate models considered in the study. STE, stratospheric–tropospheric exchange](/paper-figures/8ced7d5bd3fc44ac9f40cfcda6747821/changes-in-tropospheric-air-quality-related-to-the-protection-of-stratospheric-figure-9.jpg)
![Fig. 10 Atmospheric degradation pathways and corresponding yields of TFA for HFCF-123 (A), HFC-134a (B) and HFO-1234yf (C) representing three generations of important CFC replacements. Approximate atmospheric lifetimes for the chemical species involved are indicated in parenthesis. Species marked by an asterisk have significant competing fates in the atmosphere [205, 206]](/paper-figures/95a85555859b4d9bab71501ffa1c10ba/changes-in-tropospheric-air-quality-related-to-the-protection-of-stratospheric-figure-10.jpg)
![Fig. 11 Atmospheric degradation of HCFO-1233zd. The OH-initiated oxidation of the product, CF3CHO, is a minor source of TFA. Based on [207] and [208]](/paper-figures/94e0d42214df446b9786bcfa2392f254/changes-in-tropospheric-air-quality-related-to-the-protection-of-stratospheric-figure-11.jpg)

![Fig. 13 Concentration of trifluoroacetate in composite precipitation samples from eight sites in Germany from February 2018 to February 2020. The y-axis is on a binary logarithmic scale (log2) and the solid horizontal bar is the median, the box indicates the upper and lower quartiles, the whiskers the upper of lower quartile – or + the interquartile range × 1.5, and the data symbols are the outliers. From Fig. 27 in [220]](/paper-figures/9844568eb76344f0af7502a585cfb2ee/changes-in-tropospheric-air-quality-related-to-the-protection-of-stratospheric-figure-13.jpg)
![Fig. 14 Maximum possible annual emissions of TFA from plant protection products in Germany for active ingredients that can theoretically form TFA. Data based on mean sales volume of each of the active substances over the three years 2016, 2017 and 2018 (Figure from [259])](/paper-figures/344b5be317f24f9fa124a71ce4116660/changes-in-tropospheric-air-quality-related-to-the-protection-of-stratospheric-figure-14.jpg)

Verification
Claims the paper makes
268 Not checked yet · 105 Own interpretation · 43 No basis given · 8 Supported · 6 Partly supported · 4 Own result · 1 Not supported · accuracy not yet measured
At least one cited source doesn’t support this claim or points to a different paper, and none confirmed it — see the verdicts below.
In the paper
“However, there is insufficient agreement between models to quantify trends.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Disputedcites [161] Abalos, M., Orbe, C., Kinnison, D. E., Plummer, D., Oman, L. D., Jöckel, P., Morgenstern, O., Garcia, R. R., Zeng, G., Stone, K. A., & Dameris, M. (2020). Future trends in stratosphere-to-troposphere transport in CCMI models. Atmospheric Chemistry and Physics, 20(11), 6883–6901. https://doi.org/10.5194/acp-20-6883-2020 sourceExperimental — accuracy not yet measured
The Conclusions (section 6; page not provided) say all models agree on a future increase in stratospheric tracers in the troposphere and quantify projected changes, including a 10%–16% increase in the tropospheric column of stratospheric ozone. Section 4 notes limited model agreement for the eddy-mixing term specifically, but that narrower uncertainty does not support the claim that model agreement is insufficient to quantify exchange trends generally. (LLM, conf=0.89)
Checked by a reasoning model — may be wrong.
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Disputed
The cited sources support only part of this claim — read each source’s verdict below.
In the paper
“However, recent climate model simulations [20–22], also reviewed by Bernhard et al. [23], suggest that under some scenarios of increasing greenhouse gas emissions, stratospheric O3 could exceed the 1980 baseline (the so-called “super-recovery”).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Partly supportedcites [20] Butler, A. H., Daniel, J. S., Portmann, R. W., Ravishankara, A. R., Young, P. J., Fahey, D. W., & Rosenlof, K. H. (2016). Diverse policy implications for future ozone and surface UV in a changing climate. Environmental Research Letters, 11(6), 064017. https://doi.org/10.1088/1748-9326/11/6/064017 sourceExperimental — accuracy not yet measured
The Results report that under the high-emissions RCP 8.5 scenario, stratospheric ozone substantially exceeds historical levels in the extratropics, while remaining depleted in the tropics. The paper compares future ozone with a 1955–1975 historical period, not an explicitly defined 1980 baseline, so that specific baseline is not verified by our copy. (LLM, conf=0.86)
- Partly supportedcites [21] Keeble, J., Hassler, B., Banerjee, A., Checa-Garcia, R., Chiodo, G., Davis, S., Eyring, V., Griffiths, P. T., Morgenstern, O., Nowack, P., Zeng, G., Zhang, J., Bodeker, G., Burrows, S., Cameron-Smith, P., Cugnet, D., Danek, C., Deushi, M., Horowitz, L. W., Kubin, A., et al. (2021). Evaluating stratospheric ozone and water vapour changes in CMIP6 models from 1850 to 2100. Atmospheric Chemistry and Physics, 21(6), 5015–5061. https://doi.org/10.5194/acp-21-5015-2021 sourceExperimental — accuracy not yet measured
Section 3.3 projects super-recovery under the higher-emissions SSP3-7.0 and SSP5-8.5 scenarios, supporting the claim's central point. But that result concerns total column ozone at midlatitudes and high latitudes, not stratospheric ozone alone; the paper compares the projected exceedance with 1960s values, rather than explicitly with a 1980 baseline. The Discussion and conclusions also notes that tropospheric ozone contributes to the projected increase. (LLM, conf=0.84)
- Partly supportedcites [22] Shepherd, T. G. (2008). Dynamics, stratospheric ozone, and climate change. Atmosphere-Ocean, 46(1), 117–138. https://doi.org/10.3137/ao.460106 sourceExperimental — accuracy not yet measured
The Summary and discussion predicts that future near-global ozone will exceed 1980 levels. But it explicitly says this is not evidence of long-term “super-recovery”: in the model, 1980 ozone was already depleted, and the increase tracks declining halogens rather than a demonstrated greenhouse-gas effect. (LLM, conf=0.88)
- Supportedcites [23] Bernhard, G. H., Bais, A. F., Aucamp, P. J., Klekociuk, A. R., Liley, J. B., & McKenzie, R. L. (2023). Stratospheric ozone, UV radiation, and climate interactions. Photochemical & Photobiological Sciences. https://doi.org/10.1007/s43630-023-00371-y source
In “Estimates of total column ozone during the twenty-first century,” the paper projects that, under scenarios with continued greenhouse-gas increases, near-global mean total column ozone will significantly exceed 1980 levels. It calls this overshoot “super-recovery.” (LLM, conf=0.94)
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Partly supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“A similar effect on CCN was also observed upon UV-B irradiation of SOA formed from the oxidation of α-pinene and naphthalene [74], which are biogenic and anthropogenic SOA precursors, respectively.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
What the sources say
- Supportedcites [74] Borduas-Dedekind, N., Nizkorodov, S., & McNeill, K. (2020). UVB-irradiated laboratory-generated secondary organic aerosol extracts have increased cloud condensation nuclei abilities: Comparison with dissolved organic matter and implications for the photomineralization mechanism. Chimia (Aarau), 74(3), 142–148. https://doi.org/10.2533/chimia.2020.142 source
Section 3.2 reports that UVB irradiation increased the CCN ability of both α-pinene and naphthalene SOA extracts. The Introduction identifies α-pinene and naphthalene as representative biogenic and anthropogenic precursors, respectively. (LLM, conf=0.94)
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
The cited sources support only part of this claim — read each source’s verdict below.
In the paper
“Research conducted as part of the ‘Effects of Low-Level Air Pollution: A Study in Europe’ (ELAPSE) [81, 86–92] examined the mortality and morbidity effects of exposure to low concentrations of four air pollutants: PM2.5, NO2, black carbon (BC), and tropospheric warm season O3, with some of the research also investigating the importance of elemental components of PM2.5 [88, 92–94].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [81] Brunekreef, B., Strak, M., Chen, J., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bellander, T., Boutron-Ruault, M. C., Brandt, J., Carey, I., Cesaroni, G., Forastiere, F., Fecht, D., Gulliver, J., Hertel, O., Hoffmann, B., de Hoogh, K., Houthuijs, D., Hvidtfeldt, U. A., & Janssen, N. A. H., et al. (2021). Mortality and morbidity effects of long-term exposure to low-level PM2.5, BC, NO2, and O3: An analysis of European cohorts in the ELAPSE project (Vol. WA 754 R432 No. 208, HEI Report Series): Health Effects Institute
- Partly supportedcites [86] Liu, S., Jørgensen, J. T., Ljungman, P., Pershagen, G., Bellander, T., Leander, K., Magnusson, P. K. E., Rizzuto, D., Hvidtfeldt, U. A., Raaschou-Nielsen, O., Wolf, K., Hoffmann, B., Brunekreef, B., Strak, M., Chen, J., Mehta, A., Atkinson, R. W., Bauwelinck, M., Varraso, R., Boutron-Ruault, M. C., et al. (2021). Long-term exposure to low-level air pollution and incidence of chronic obstructive pulmonary disease: The ELAPSE project. Environment International, 146, 106267. https://doi.org/10.1016/j.envint.2020.106267 sourceExperimental — accuracy not yet measured
The Introduction states that this ELAPSE study investigated low-level exposure to PM2.5, NO2, black carbon, and ozone in relation to COPD development. The Exposure assessment section specifies warm-season ozone. COPD incidence is a morbidity outcome, but this paper does not examine mortality; page numbers are unavailable in our copy. (LLM, conf=0.88)
- Partly supportedcites [87] Wolf, K., Hoffmann, B., Andersen, Z. J., Atkinson, R. W., Bauwelinck, M., Bellander, T., Brandt, J., Brunekreef, B., Cesaroni, G., Chen, J., de Faire, U., de Hoogh, K., Fecht, D., Forastiere, F., Gulliver, J., Hertel, O., Hvidtfeldt, U. A., Janssen, N. A. H., Jørgensen, J. T., Katsouyanni, K., et al. (2021). Long-term exposure to low-level ambient air pollution and incidence of stroke and coronary heart disease: A pooled analysis of six European cohorts within the ELAPSE project. Lancet Planet Health, 5(9), e620–e632. https://doi.org/10.1016/s2542-5196(21)00195-9 sourceExperimental — accuracy not yet measured
The Summary (p. 1) says this ELAPSE analysis examined long-term exposure to PM2.5, NO2, black carbon, and warm-season ozone in relation to stroke and coronary heart disease incidence. These are morbidity outcomes; the paper does not report an analysis of mortality, so it does not support that part of the attributed claim. (LLM, conf=0.88)
- Partly supportedcites [88] Chen, J., Rodopoulou, S., Strak, M., de Hoogh, K., Taj, T., Poulsen, A. H., Andersen, Z. J., Bellander, T., Brandt, J., Zitt, E., Fecht, D., Forastiere, F., Gulliver, J., Hertel, O., Hoffmann, B., Hvidtfeldt, U. A., Verschuren, W. M. M., Jørgensen, J. T., Katsouyanni, K., Ketzel, M., et al. (2022). Long-term exposure to ambient air pollution and bladder cancer incidence in a pooled European cohort: The ELAPSE project. British Journal of Cancer. https://doi.org/10.1038/s41416-022-01735-4 sourceExperimental — accuracy not yet measured
The ELAPSE project description and §2.2 Exposure assessment (page unavailable) show that this study examined bladder cancer incidence in relation to PM2.5, NO2, black carbon, and warm-season O3, as well as PM2.5 components. It therefore supports the morbidity and pollutant parts of the collective claim, but this paper did not itself examine mortality. (LLM, conf=0.86)
- Partly supportedcites [89] Samoli, E., Rodopoulou, S., Hvidtfeldt, U. A., Wolf, K., Stafoggia, M., Brunekreef, B., Strak, M., Chen, J., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bellander, T., Brandt, J., Cesaroni, G., Forastiere, F., Fecht, D., Gulliver, J., Hertel, O., Hoffmann, B., de Hoogh, K., et al. (2021). Modeling multi-level survival data in multi-center epidemiological cohort studies: Applications from the ELAPSE project. Environment International, 147, 106371. https://doi.org/10.1016/j.envint.2020.106371 sourceExperimental — accuracy not yet measured
The Introduction describes ELAPSE as investigating health outcomes after exposure to low levels of air pollution. The exposure-assessment passage lists PM2.5, NO2, ozone and black carbon, but says this paper focuses on PM2.5 and NO2; it does not specify warm-season ozone or report mortality and morbidity analyses for all four pollutants. (LLM, conf=0.85)
- Partly supportedcites [90] Stafoggia, M., Oftedal, B., Chen, J., Rodopoulou, S., Renzi, M., Atkinson, R. W., Bauwelinck, M., Klompmaker, J. O., Mehta, A., Vienneau, D., Andersen, Z. J., Bellander, T., Brandt, J., Cesaroni, G., de Hoogh, K., Fecht, D., Gulliver, J., Hertel, O., Hoffmann, B., Hvidtfeldt, U. A., et al. (2022). Long-term exposure to low ambient air pollution concentrations and mortality among 28 million people: Results from seven large European cohorts within the ELAPSE project. Lancet Planet Health, 6(1), e9–e18. https://doi.org/10.1016/s2542-5196(21)00277-1 sourceExperimental — accuracy not yet measured
The Introduction identifies PM2.5, NO2, black carbon, and warm-season O3 as the four pollutants studied at low exposure levels. The Introduction and Results address mortality outcomes, but this paper does not examine morbidity outcomes, so it supports only that part of the citing sentence. (LLM, conf=0.86)
- Partly supportedcites [91] Strak, M., Weinmayr, G., Rodopoulou, S., Chen, J., de Hoogh, K., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bekkevold, T., Bellander, T., Boutron-Ruault, M. C., Brandt, J., Cesaroni, G., Concin, H., Fecht, D., Forastiere, F., Gulliver, J., Hertel, O., Hoffmann, B., Hvidtfeldt, U. A., et al. (2021). Long term exposure to low level air pollution and mortality in eight European cohorts within the ELAPSE project: Pooled analysis. British Medical Journal, 374, n1904. https://doi.org/10.1136/bmj.n1904 sourceExperimental — accuracy not yet measured
The Introduction says this ELAPSE analysis investigated low-level exposure to PM2.5, nitrogen dioxide, ozone, and black carbon, and the Methods specify warm-season ozone. But the Methods (Mortality data) and Abstract (Main outcome measures) identify mortality as the outcome; this paper does not report an analysis of morbidity. (LLM, conf=0.88)
- Not checked yetcites [92] Rodopoulou, S., Stafoggia, M., Chen, J., de Hoogh, K., Bauwelinck, M., Mehta, A. J., Klompmaker, J. O., Oftedal, B., Vienneau, D., Janssen, N. A. H., Strak, M., Andersen, Z. J., Renzi, M., Cesaroni, G., Nordheim, C. F., Bekkevold, T., Atkinson, R., Forastiere, F., Katsouyanni, K., Brunekreef, B., et al. (2022). Long-term exposure to fine particle elemental components and mortality in Europe: Results from six European administrative cohorts within the ELAPSE project. Science of the Total Environment, 809, 152205. https://doi.org/10.1016/j.scitotenv.2021.152205 source
- Partly supportedcites [93] Chen, J., Rodopoulou, S., de Hoogh, K., Strak, M., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bellander, T., Brandt, J., Cesaroni, G., Concin, H., Fecht, D., Forastiere, F., Gulliver, J., Hertel, O., Hoffmann, B., Hvidtfeldt, U. A., Janssen, N. A. H., Jöckel, K. H., Jørgensen, J., et al. (2021). Long-term exposure to fine particle elemental components and natural and cause-specific mortality—A pooled analysis of eight european cohorts within the ELAPSE Project. Environmental Health Perspectives, 129(4), 47009. https://doi.org/10.1289/ehp8368 sourceExperimental — accuracy not yet measured
The Introduction (page not provided) identifies this paper as part of ELAPSE, describes its low-level air-pollution focus, and states that it investigates PM2.5 components and mortality. The Methods assess PM2.5 and NO2 exposure and mention black-carbon exposure models, but the passages do not establish the claimed morbidity research or investigation of warm-season ozone. (LLM, conf=0.86)
- Partly supportedcites [94] So, R., Chen, J., Mehta, A. J., Liu, S., Strak, M., Wolf, K., Hvidtfeldt, U. A., Rodopoulou, S., Stafoggia, M., Klompmaker, J. O., Samoli, E., Raaschou-Nielsen, O., Atkinson, R., Bauwelinck, M., Bellander, T., Boutron-Ruault, M. C., Brandt, J., Brunekreef, B., Cesaroni, G., Concin, H., et al. (2021). Long-term exposure to air pollution and liver cancer incidence in six European cohorts. International Journal of Cancer, 149(11), 1887–1897. https://doi.org/10.1002/ijc.33743 sourceExperimental — accuracy not yet measured
The Introduction identifies this as an ELAPSE study of air pollution and liver cancer incidence, and Section 2.3 lists all four pollutants, including warm-season ozone, in its exposure assessment. The Abstract says the study examined liver cancer incidence at concentrations below current EU standards; it does not report mortality effects, so that part of the sentence is not supported by this source. (LLM, conf=0.85)
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Every source the paper cites for this claim was checked and supports it.
In the paper
“Per IQR increase in the 5-year average PM2.5 (3.2 µg m−3) and NO2 (22 µg m−3), they found an association with the development of dementia HR = 1.060 (95% CI 1.054–1.066)”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Supportedcites [115] Shi, L., Steenland, K., Li, H., Liu, P., Zhang, Y., Lyles, R. H., Requia, W. J., Ilango, S. D., Chang, H. H., Wingo, T., Weber, R. J., & Schwartz, J. (2021). A national cohort study (2000–2018) of long-term air pollution exposure and incident dementia in older adults in the United States. Nature Communications, 12(1), 6754. https://doi.org/10.1038/s41467-021-27049-2 source
The Abstract in our copy reports approximately 2.0 million incident dementia cases in a US Medicare cohort and gives an HR of 1.060 (95% CI 1.054–1.066) per IQR increase in 5-year average PM2.5 (3.2 µg/m³). The Results (Health effect estimates) likewise report an increased dementia risk, though the single-pollutant estimate there is 1.061. (LLM, conf=0.94)
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“The interaction of temperature with PM10 was significant for cardiovascular causes of death for all ages (2.24% on days with low PM10 (95% CI 1.01–3.47), while it was 2.63% (95% CI 1.57–3.71) on days with high PM10.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Supportedcites [107] Analitis, A., De’ Donato, F., Scortichini, M., Lanki, T., Basagana, X., Ballester, F., Astrom, C., Paldy, A., Pascal, M., Gasparrini, A., Michelozzi, P., & Katsouyanni, K. (2018). Synergistic effects of ambient temperature and air pollution on health in Europe: Results from the PHASE Project. International Journal of Environmental Research and Public Health. https://doi.org/10.3390/ijerph15091856 source
The Results (Section 3) report a significant interaction between maximum apparent temperature and PM10 for cardiovascular deaths at all ages. They give the cited 2.24% increase on low-PM10 days (95% CI 1.01–3.47) and 2.63% on high-PM10 days (95% CI 1.57–3.71). (LLM, conf=0.95)
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“Leaf-area was reduced by 21%, biomass of leaves by 14%, shoots by 23%, and roots by 17% [118].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Supportedcites [118] Li, C., Gu, X., Wu, Z., Qin, T., Guo, L., Wang, T., Zhang, L., & Jiang, G. (2021). Assessing the effects of elevated ozone on physiology, growth, yield and quality of soybean in the past 40 years: A meta-analysis. Ecotoxicology and Environmental Safety, 208, 111644. https://doi.org/10.1016/j.ecoenv.2020.111644 source
Section 3.1 reports a 20.8% reduction in soybean leaf area under elevated ozone compared with charcoal-filtered air, which rounds to 21%. The same section reports reductions of 13.8%, 22.8%, and 16.9% for leaf, shoot, and root dry weight, matching the other rounded figures in the citing sentence. (LLM, conf=0.95)
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“Effects of ozone on plants are mediated by the formation of free radicals in the tissues of the plants.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Supportedcites [131] Oksanen, E., & Kontunen-Soppela, S. (2021). Plants have different strategies to defend against air pollutants. Current Opinion in Environmental Science & Health, 19, 100222. https://doi.org/10.1016/j.coesh.2020.10.010 source
Section 1.2, “Defense mechanisms against air pollutants” (page not available), says that oxidative air pollutants entering leaves trigger a burst of reactive oxygen species, including free radicals. The same section identifies ozone exposure as an approach used to study oxidative stress in plants, supporting the claimed mechanism. (LLM, conf=0.90)
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
The cited sources support only part of this claim — read each source’s verdict below.
In the paper
“Folds in the tropopause have a direct impact on air quality at ground level.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [162] Akritidis, D., Pozzer, A., Flemming, J., Inness, A., & Zanis, P. (2021). A global climatology of tropopause folds in CAMS and MERRA-2 reanalyses. Journal of Geophysical Research: Atmospheres, 126(8), e2020JD034115. https://doi.org/10.1029/2020JD034115 source
- Partly supportedcites [163] Liu, J. H., Rodriguez, J. M., Oman, L. D., Douglass, A. R., Olsen, M. A., & Hu, L. (2020). Stratospheric impact on the Northern Hemisphere winter and spring ozone interannual variability in the troposphere. Atmospheric Chemistry and Physics, 20(11), 6416–6432. https://doi.org/10.5194/acp-20-6417-2020 sourceExperimental — accuracy not yet measured
The Conclusions and discussion link stratospheric folds near jet streams to a stronger stratospheric influence on tropospheric ozone, and Results §3.1 notes that stratospheric ozone can contribute to surface ozone in spring. But the paper does not establish a direct impact of tropopause folds themselves on ground-level air quality; its own analysis focuses on ozone in the troposphere. (LLM, conf=0.83)
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
The cited sources support only part of this claim — read each source’s verdict below.
In the paper
“The longer atmospheric lifetimes of the older generation HFCs allowed wider and more even distribution of parent HFCs and deposition of TFA, across the globe [215–217].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Contribution of chemicals under the purview of the Montreal Protocol to the global load of trifluoroacetic acid
What the sources say
- Not checked yetcites [215] Sulbaek Andersen, M. P., Schmidt, J. A., Volkova, A., & Wuebbles, D. J. (2018). A three-dimensional model of the atmospheric chemistry of E and Z-CF3CH=CHCl (HCFO-1233(zd) (E/Z)). Atmospheric Environment, 179, 250–259. https://doi.org/10.1016/j.atmosenv.2018.02.018 source
- Partly supportedcites [216] Holland, R., Khan, M. A. H., Driscoll, I., Chhantyal-Pun, R., Derwent, R. G., Taatjes, C. A., Orr-Ewing, A. J., Percival, C. J., & Shallcross, D. E. (2021). Investigation of the production of trifluoroacetic acid from two halocarbons, HFC-134a and HFO-1234yf and its fates using a global three-dimensional chemical transport model. ACS Earth and Space Chemistry, 5, 849–857. https://doi.org/10.1021/acsearthspacechem.0c00355 sourceExperimental — accuracy not yet measured
The Introduction (page unavailable) says HFO-1234yf degrades faster than HFC-134a and predicts more localised TFA deposition after a switch to HFO-1234yf. This supports a broader deposition pattern under HFC-134a use, but the copy does not establish that parent HFCs or TFA deposition were evenly distributed across the globe. (LLM, conf=0.82)
- Supportedcites [217] David, L. M., Barth, M., Höglund-Isaksson, L., Purohit, P., Velders, G. J., Glaser, S., & Ravishankara, A. R. (2021). Trifluoroacetic acid deposition from emissions of HFO-1234yf in India, China, and the Middle East. Atmospheric Chemistry and Physics, 21(19), 14833–14849. https://doi.org/10.5194/acp-21-14833-2021 source
The Introduction (p. 1) says HFC-134a has an atmospheric lifetime of about 14 years, is reasonably well mixed globally, and consequently degrades and forms TFA across the globe. This supports the claim's contrast between longer-lived older refrigerants and more localized deposition from short-lived HFO-1234yf. (LLM, conf=0.91)
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Every source the paper cites for this claim was checked and supports it.
In the paper
“A recent study on temporal trends in concentrations of TFA in surface waters reported increases in concentrations of sixfold between samples collected in 1998 and those collected in 2021 [221].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Trifluoroacetic acid in precipitation
What the sources say
- Supportedcites [221] Cahill, T. M. (2022). Increases in trifluoroacetate concentrations in surface waters over two decades. Environmental Science & Technology, 56(13), 9428–9434. https://doi.org/10.1021/acs.est.2c01826 source
The Results and Discussion section (Temporal Changes in TFA Concentrations) reports an average 6.0-fold increase in surface-water TFA concentrations across 33 sites sampled in both 1998 and 2021. This directly supports the cited sentence. (LLM, conf=0.95)
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
In the paper
“By 2100, stratospheric O3 could increase by an additional 10% (above the 1980 levels) under high emission scenarios (SSP3-7.0, SSP4-6.0 and SSP5-8.5; see Fig. 3 of Bernhard et al. [23]).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [23] Bernhard, G. H., Bais, A. F., Aucamp, P. J., Klekociuk, A. R., Liley, J. B., & McKenzie, R. L. (2023). Stratospheric ozone, UV radiation, and climate interactions. Photochemical & Photobiological Sciences. https://doi.org/10.1007/s43630-023-00371-y source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
None of the sources cited for this claim have been checked yet.
In the paper
“The decreases in UV radiation at the surface, expected from the recovery of stratospheric O3, to 1980 levels are estimated to have only a small impact on ambient O3, as reported previously [14, 15], since reductions of O3 at mid-latitudes have been limited to only a few percent (relative to a 1980 baseline).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [14] Zhang, H., Wu, S., Huang, Y., & Wang, Y. (2014). Effects of stratospheric ozone recovery on photochemistry and ozone air quality in the troposphere. Atmospheric Chemistry and Physics, 14(8), 4079–4086. https://doi.org/10.5194/acp-14-4079-2014 source
- Not checked yetcites [15] Hodzic, A., & Madronich, S. (2018). Response of surface ozone over the continental United States to UV radiation declines from the expected recovery of stratospheric ozone. npj Climate and Atmospheric Science, 1(1), 35. https://doi.org/10.1038/s41612-018-0045-5 source
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Contributions from stratospheric ozone depletion (1980 to current) and the associated increases in UV-B radiation have been negligible by comparison, at least for the global scale.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [11] Szopa, S., Naik, V., Adhikary, B., Artaxo, P., Berntsen, T., Collins, W. D., Fuzzi, S., Gallardo, L., Scharr, A. K., Klimont, Z., Liao, H., Unger, N., & Zanis, P. (2021). Short-lived climate forcers. In V. Masson-Delmotte, P. Zhai, A. Pirani, S. L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M. I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J. B. R. Matthews, T. K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, & B. Zhou (Eds.), Climate Change 2021: The physical science basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Chan
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“More recently, Ipiña et al. [42] found that the UV Index in Mexico City increased by ca. 20% over 2000–2019 (due to reductions in PM, SO2, O3, and NO2) and estimated that such increases in UV radiation would require an additional 10% reduction in VOC emissions to meet the same ground-level O3 concentrations had the UV remained constant.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [42] Ipiña, A., López-Padilla, G., Retama, A., Piacentini, R. D., & Madronich, S. (2021). Ultraviolet radiation environment of a tropical megacity in transition: Mexico City 2000–2019. Environmental Science & Technology. https://doi.org/10.1021/acs.est.0c08515 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“UV-B irradiation (~ 4.5 days solar radiation equivalent) of dissolved organic matter (DOM, used as a surrogate for organic aerosols) from freshwaters resulted in an increase of hygroscopicity by up to 2.5 times [73].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
What the sources say
- Not checked yetcites [73] Borduas-Dedekind, N., Ossola, R., David, R. O., Boynton, L. S., Weichlinger, V., Kanji, Z. A., & McNeill, K. (2019). Photomineralization mechanism changes the ability of dissolved organic matter to activate cloud droplets and to nucleate ice crystals. Atmospheric Chemistry and Physics, 19(19), 12397–12412. https://doi.org/10.5194/acp-19-12397-2019 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“For example, aerosol haze in China was reduced substantially during the last decade due to lower emissions of NOx and SO2.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [29] Shi, H., Zhang, J., Zhao, B., Xia, X., Hu, B., Chen, H., Wei, J., Liu, M., Bian, Y., Fu, D., Gu, Y., & Liou, K.-N. (2021). Surface brightening in Eastern and Central China since the implementation of the Clean Air Action in 2013: Causes and implications. Geophysical Research Letters, 48(3), e2020GL091105. https://doi.org/10.1029/2020GL091105 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
None of the sources cited for this claim have been checked yet.
In the paper
“Brief increases in UV radiation at the surface have been observed during the economic slowdowns related to the COVID-19 pandemic, e.g., in Brazil [43], East Asia [44], India [45], and likely in many other locations.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [43] Becerra-Rondón, A., Ducati, J., & Haag, R. (2021). Partial COVID-19 lockdown effect in atmospheric pollutants and indirect impact in UV radiation in Rio Grande do Sul, Brazil. Atmósfera. https://doi.org/10.20937/atm.53027 source
- Not checked yetcites [44] Ming, Y., Lin, P., Naik, V., Paulot, F., Horowitz, L. W., Ginoux, P. A., Ramaswamy, V., Loeb, N. G., Shen, Z., Singer, C. E., Ward, R. X., Zhang, Z., & Bellouin, N. (2021). Assessing the influence of COVID-19 on the shortwave radiative fluxes over the East Asian marginal seas. Geophysical Research Letters, 48(3), e2020GL091699. https://doi.org/10.1029/2020GL091699 source
- Not checked yetcites [45] Bera, B., Bhattacharjee, S., Shit, P. K., Sengupta, N., & Saha, S. (2022). Variation and correlation between ultraviolet index and tropospheric ozone during COVID-19 lockdown over megacities of India. Stochastic Environmental Research and Risk Assessment, 36(2), 409–427. https://doi.org/10.1007/s00477-021-02033-w source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Of the 235 nominally significant meta-analyses, all but 5 indicated an adverse effect on human health.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“asthma-related admissions per 10 µg m−3 increase of PM2.5 and NO2 levels (short-term exposure; OR: 1.022, 95% CI 1.014–1.031 and OR: 1.019, 95% CI 1.1013–1.024, respectively);”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“mortality due to pneumonia per 10 µg m−3 increase NO2 levels (long-term exposure; Hazard Ratio (HR): 1.077, 95% CI 1.060–1.094).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“For NO2, hazard ratios remained elevated and significant when analyses were restricted to observations below 20 μg m−3.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [91] Strak, M., Weinmayr, G., Rodopoulou, S., Chen, J., de Hoogh, K., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bekkevold, T., Bellander, T., Boutron-Ruault, M. C., Brandt, J., Cesaroni, G., Concin, H., Fecht, D., Forastiere, F., Gulliver, J., Hertel, O., Hoffmann, B., Hvidtfeldt, U. A., et al. (2021). Long term exposure to low level air pollution and mortality in eight European cohorts within the ELAPSE project: Pooled analysis. British Medical Journal, 374, n1904. https://doi.org/10.1136/bmj.n1904 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“hypertension per 10 µg m−3 increase of PM2.5 (short-term exposure; odds ratio (OR) 1.097, 95% CI 1.060–1.136);”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“chronic obstructive pulmonary disease (COPD) and asthma-related admissions of the elderly per 10 µg m−3 increase of NO2 (24 h average; RR: 1.386%, 95% CI 1.110–1.661%);”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“A meta-analysis [96] of 107 studies on the effect of long-term exposure to air pollution on mortality showed that there was strong evidence that exposure to PM2.5 and PM10 is associated with increased mortality from all causes, cardiovascular disease, respiratory disease, and lung cancer.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [96] Chen, J., & Hoek, G. (2020). Long-term exposure to PM and all-cause and cause-specific mortality: A systematic review and meta-analysis. Environment International, 143, 105974. https://doi.org/10.1016/j.envint.2020.105974 source
boostedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“An increase of 5 µg m−3 in PM2.5 was associated with 13% (95% CI 10.6–15.5%) increase in natural deaths.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [91] Strak, M., Weinmayr, G., Rodopoulou, S., Chen, J., de Hoogh, K., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bekkevold, T., Bellander, T., Boutron-Ruault, M. C., Brandt, J., Cesaroni, G., Concin, H., Fecht, D., Forastiere, F., Gulliver, J., Hertel, O., Hoffmann, B., Hvidtfeldt, U. A., et al. (2021). Long term exposure to low level air pollution and mortality in eight European cohorts within the ELAPSE project: Pooled analysis. British Medical Journal, 374, n1904. https://doi.org/10.1136/bmj.n1904 source
plaincorrelationaln = 325,367- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“This study also indicated that associations with PM2.5 remained relevant below the current WHO standards of 10 µg PM2.5 m−3.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [96] Chen, J., & Hoek, G. (2020). Long-term exposure to PM and all-cause and cause-specific mortality: A systematic review and meta-analysis. Environment International, 143, 105974. https://doi.org/10.1016/j.envint.2020.105974 source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“an increased risk of stroke-related mortality per 10 µg m−3 increase of PM10 and PM2.5 (short-term exposure; relative risk (RR): 1.005 95% CI 1.003–1.007 and RR: 1.014, 95% CI 1.009–1.020, respectively);”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“The effect of low-level air pollution exposure in 22 cohorts (a combination of research and administrative cohorts) across Europe was associated with several health outcomes and mortality [81].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [81] Brunekreef, B., Strak, M., Chen, J., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bellander, T., Boutron-Ruault, M. C., Brandt, J., Carey, I., Cesaroni, G., Forastiere, F., Fecht, D., Gulliver, J., Hertel, O., Hoffmann, B., de Hoogh, K., Houthuijs, D., Hvidtfeldt, U. A., & Janssen, N. A. H., et al. (2021). Mortality and morbidity effects of long-term exposure to low-level PM2.5, BC, NO2, and O3: An analysis of European cohorts in the ELAPSE project (Vol. WA 754 R432 No. 208, HEI Report Series): Health Effects Institute
plaincorrelationaln = 325,367- Asserted: passes — The authors put it forward as true.
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In the paper
“Hazard ratios were larger in cohort subsets with exposure levels below the annual average limits for the European Union and United States (Table 1) and proposed World Health Organization guidelines for PM2.5 and NO2 (Table 1) compared to the hazard ratios in cohorts exposed to levels above the annual limits.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [95] Liu, S., Jørgensen, J. T., Ljungman, P., Pershagen, G., Bellander, T., Leander, K., Magnusson, P. K. E., Rizzuto, D., Hvidtfeldt, U. A., Raaschou-Nielsen, O., Wolf, K., Hoffmann, B., Brunekreef, B., Strak, M., Chen, J., Mehta, A., Atkinson, R. W., Bauwelinck, M., Varraso, R., Boutron-Ruault, M. C., et al. (2021). Long-term exposure to low-level air pollution and incidence of asthma: The ELAPSE project. European Respiratory Journal. https://doi.org/10.1183/13993003.03099-2020 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
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The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Many countries have acted by regulating concentrations of key pollutants and there has been a remarkable decrease in air pollution levels in almost all countries with developed economies leading to levels below the air pollution standards.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“For participants with exposures below the United States standard of 12 µg m−3, an increase of 5 µg m−3 PM2.5 was associated with nearly a 30% [29.6% (95% CI 14–47.4%)] increase in natural deaths.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [91] Strak, M., Weinmayr, G., Rodopoulou, S., Chen, J., de Hoogh, K., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bekkevold, T., Bellander, T., Boutron-Ruault, M. C., Brandt, J., Cesaroni, G., Concin, H., Fecht, D., Forastiere, F., Gulliver, J., Hertel, O., Hoffmann, B., Hvidtfeldt, U. A., et al. (2021). Long term exposure to low level air pollution and mortality in eight European cohorts within the ELAPSE project: Pooled analysis. British Medical Journal, 374, n1904. https://doi.org/10.1136/bmj.n1904 source
plaincorrelationaln = 325,367- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Figure 10 illustrates how atmospheric degradation of different CFC replacements, belonging to three successive generations of CFC replacements, can lead to the formation of TFA in significantly different yields.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Chemical pathways for degradation of precursors to trifluoroacetic acid
plaindirect- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Figure 11 illustrates the atmospheric degradation of HCFO-1233zd(E), which produces CF3CHO in essentially 100% yield.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Chemical pathways for degradation of precursors to trifluoroacetic acid
plaindirect- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“HFC-134a and HFO-1234yf are the two substitutes that have the largest predicted contribution to global TFA concentrations among those gases that fall under the purview of the Montreal Protocol.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Contribution of chemicals under the purview of the Montreal Protocol to the global load of trifluoroacetic acid
plaindirect- Asserted: passes — The authors put it forward as true.
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- Load-bearing: passes — The paper’s conclusions depend on it.
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None of the sources cited for this claim have been checked yet.
In the paper
“Studies on degradation by microbiota, including species and strains from contaminated areas, have not shown any evidence of TFA being susceptible to microbiological degradation [202, 203].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Background
What the sources say
- Not checked yetcites [202] Scheurer, M., Nödler, K., Freeling, F., Janda, J., Happel, O., Riegel, M., Müller, U., Storck, F. R., Fleig, M., Lange, F. T., Brunsch, A., & Brauch, H.-J. (2017). Small, mobile, persistent: Trifluoroacetate in the water cycle—Overlooked sources, pathways, and consequences for drinking water supply. Water Research, 126, 460–471. https://doi.org/10.1016/j.watres.2017.09.045 source
- Not checked yetcites [203] Alexandrino, D. A. M., Ribeiro, I., Pinto, L. M., Cambra, R., Oliveira, R. S., Pereira, F., & Carvalho, M. F. (2018). Biodegradation of mono-, di- and trifluoroacetate by microbial cultures with different origins. New Biotechnology, 43, 23–29. https://doi.org/10.1016/j.nbt.2017.08.005 source
plain- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
None of the sources cited for this claim have been checked yet.
In the paper
“Changing weather patterns due to the Antarctic ozone hole have been observed in the Southern Hemisphere [23, 169, 170].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [23] Bernhard, G. H., Bais, A. F., Aucamp, P. J., Klekociuk, A. R., Liley, J. B., & McKenzie, R. L. (2023). Stratospheric ozone, UV radiation, and climate interactions. Photochemical & Photobiological Sciences. https://doi.org/10.1007/s43630-023-00371-y source
- Not checked yetcites [169] Barnes, P. W., Robson, T. M., Zepp, R. G., Bornman, J. F., Jansen, M. A. K., Ossola, R., Wang, Q.-W., Robinson, S. A., Foereid, B., Klekociuk, A. R., Martinez-Abaigar, J., Hou, W. C., & Paul, N. D. (2023). Interactive effects of changes in UV radiation and climate on terrestrial ecosystems, biogeochemical cycles, and feedbacks to the climate system. Photochemical & Photobiological Sciences. https://doi.org/10.1007/s43630-023-00376-7 source
- Not checked yetcites [170] Robinson, S. A., & Erickson Iii, D. J. (2015). Not just about sunburn – the ozone hole’s profound effect on climate has significant implications for Southern Hemisphere ecosystems. Global Change Biology, 21(2), 515–527. https://doi.org/10.1111/gcb.12739 source
plaindirect- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Due to these competing fates, an estimated 2–30% of atmospheric CF3CHO is converted into TFA (see SI Sect. 4).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Chemical pathways for degradation of precursors to trifluoroacetic acid
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“However, due to competing fates of the intermediary alkoxy radicals (marked with asterisks in Fig. 10), the effective yields of TFA are significantly different (e.g., ~ 60% for HCFC-123 and 7–20% for HFC-134a).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Chemical pathways for degradation of precursors to trifluoroacetic acid
What the sources say
- Not checked yetcites [205] Wallington, T. J., Schneider, W. F., Worsnop, D. R., Nielsen, O. J., Sehested, J., Debruyn, W. J., & Shorter, J. A. (1994). The environmental impact of CFC replacements HFCs and HCFCs. Environmental Science & Technology, 28(7), 320A-326A. https://doi.org/10.1021/es00056a714 source
plain- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“For example, anomalies in rainfall and droughts in the Southern Hemisphere are correlated with the duration of the Antarctic Ozone hole [171].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [171] Damiani, A., Cordero, R. R., Llanillo, P. J., Feron, S., Boisier, J. P., Garreaud, R., Rondanelli, R., Irie, H., & Watanabe, S. (2020). Connection between Antarctic Ozone and climate: Interannual precipitation changes in the southern hemisphere. Atmosphere, 11(6), 579. https://doi.org/10.3390/atmos11060579 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“These amounts of TFA are estimated to increase concentrations in the global oceans from the nominal value of 200 ng a.e. L−1 (equivalent to 239 ng TFA sodium salt L−1) estimated by Frank et al. [213] to 266–284 ng sodium salt L−1 in 2100 if evenly distributed across all oceans.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Contribution of chemicals under the purview of the Montreal Protocol to the global load of trifluoroacetic acid
What the sources say
- Not checked yetcites [213] Frank, H., Christoph, E. H., Holm-Hansen, O., & Bullister, J. L. (2002). Trifluoroacetate in ocean waters. Environmental Science & Technology, 36, 12–15. https://doi.org/10.1021/es0101532 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- The authors state this as an assumption: TFA is evenly distributed across all oceans when estimating 2100 ocean concentrations.
In the paper
“Based on this property, archived samples of various leaves of some species of trees from the German Environmental Specimen Bank were analyzed for the presence of TFA [222]. The leaves collected spanned the period from 1989 to 2020 and showed an increase in concentrations of TFA.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Trifluoroacetic acid in precipitation
What the sources say
- Not checked yetcites [222] Freeling, F., Scheurer, M., Koschorreck, J., Hoffmann, G., Ternes, T. A., & Nödler, K. (2022). Levels and temporal trends of trifluoroacetate (TFA) in archived plants: Evidence for increasing emissions of gaseous TFA precursors over the last decades. Environmental Science & Technology Letters, 5, 400–405. https://doi.org/10.1021/acs.estlett.2c00164 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“One of these locations, the Dead Sea, had a reported concentration of 6400 ng L−1 [226].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [226] Frank, H., Klein, A., & Renschen, D. (1996). Environmental trifluoroacetate. Nature, 382, 34–34. https://doi.org/10.1038/382034a0 source
plainSingle case- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“From the total known use and release of HFC-134a, HFC-143a, and HFC-227ea between 1990 and 2015, the total amount of TFA that could theoretically have been produced is 4.5 × 106 tons.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
- Rests on an assumption: The total known use and release of HFC-134a, HFC-143a, and HFC-227ea between 1990 and 2015 is complete for calculating the theoretical maximum TFA production.
In the paper
“Across all sites, frequency of detection was greater than 90% except in December, January, and February.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Trifluoroacetic acid in precipitation
What the sources say
- Not checked yetcites [220] Freeling, F., Behringer, D., Heydel, F., Scheurer, M., Ternes, T. A., & Nödler, K. (2020). Trifluoroacetate in precipitation: Deriving a benchmark dataset. Environmental Science & Technology, 54, 11210–11219. https://doi.org/10.1021/acs.est.0c02910 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“A study on concentrations of TFA present in rainwater samples in eight locations across Germany from February 2018 to 2019 showed a seasonal range of concentrations over 1 year [220].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Trifluoroacetic acid in precipitation
What the sources say
- Not checked yetcites [220] Freeling, F., Behringer, D., Heydel, F., Scheurer, M., Ternes, T. A., & Nödler, K. (2020). Trifluoroacetate in precipitation: Deriving a benchmark dataset. Environmental Science & Technology, 54, 11210–11219. https://doi.org/10.1021/acs.est.0c02910 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The background value of 200 ng TFA L−1 in the oceans as suggested by Frank et al. [213] would be equivalent to 268 × 106 tons of TFA in the global oceans if well mixed globally.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [213] Frank, H., Christoph, E. H., Holm-Hansen, O., & Bullister, J. L. (2002). Trifluoroacetate in ocean waters. Environmental Science & Technology, 36, 12–15. https://doi.org/10.1021/es0101532 source
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Analysis of rainwater samples collected in 2016 in 28 cities across China showed detectable amounts of TFA in all samples [219].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Trifluoroacetic acid in precipitation
What the sources say
- Not checked yetcites [219] Chen, H., Zhang, L., Li, M., Yao, Y., Zhao, Z., Munoz, G., & Sun, H. (2019). Per-and polyfluoroalkyl substances (PFASs) in precipitation from mainland China: Contributions of unknown precursors and short-chain (C2C3) perfluoroalkyl carboxylic acids. Water Research, 153, 169–177. https://doi.org/10.1016/j.watres.2019.01.019 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Concentrations in samples collected down-wind from the San Francisco Bay area were greater in 2021 (up to 2790 ng L−1) than in 1998 (up to 287 ng L−1).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Trifluoroacetic acid in precipitation
What the sources say
- Not checked yetcites [221] Cahill, T. M. (2022). Increases in trifluoroacetate concentrations in surface waters over two decades. Environmental Science & Technology, 56(13), 9428–9434. https://doi.org/10.1021/acs.est.2c01826 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“The Dead Sea is in a rift valley with a history of geological faulting and with a volume of 114 km3, so that this concentration is equivalent to 730 tons of TFA.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“This is very much less than the total based on the range of concentrations measured in the oceans, which, using an estimated ten-fold range, would be equivalent to 27–270 × 106 tons.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- The authors state this as an assumption: The ten-fold range used to estimate total oceanic TFA from measured concentrations is appropriate.
In the paper
“The greatest median concentration, 703 ng TFA a.e. L−1, was in June 2018.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Trifluoroacetic acid in precipitation
What the sources say
- Not checked yetcites [220] Freeling, F., Behringer, D., Heydel, F., Scheurer, M., Ternes, T. A., & Nödler, K. (2020). Trifluoroacetate in precipitation: Deriving a benchmark dataset. Environmental Science & Technology, 54, 11210–11219. https://doi.org/10.1021/acs.est.0c02910 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“For example, concentrations of TFA in leaves of Lombardy poplar increased from ca. 160 µg kg−1 (d.w.) in 1991 to ca 970 µg kg−1 in 2019.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Trifluoroacetic acid in precipitation
What the sources say
- Not checked yetcites [222] Freeling, F., Scheurer, M., Koschorreck, J., Hoffmann, G., Ternes, T. A., & Nödler, K. (2022). Levels and temporal trends of trifluoroacetate (TFA) in archived plants: Evidence for increasing emissions of gaseous TFA precursors over the last decades. Environmental Science & Technology Letters, 5, 400–405. https://doi.org/10.1021/acs.estlett.2c00164 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“A study of leachates and effluents from municipal waste disposal sites and landfills in the environs of Tianjin (China), the location of several fluorochemical manufacturing facilities, showed the presence of many PFAS as well as TFA at all sampling sites [233].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [233] Wang, B., Yao, Y., Chen, H., Chang, S., Tian, Y., & Sun, H. (2020). Per-and polyfluoroalkyl substances and the contribution of unknown precursors and short-chain (C2–C3) perfluoroalkyl carboxylic acids at solid waste disposal facilities. Science of the Total Environment, 705, 135832. https://doi.org/10.1016/j.scitotenv.2019.135832 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The median bioaccumulation factor (soil:leaf) was about 200.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [236] Lan, Z., Yao, Y., Xu, J., Chen, H., Ren, C., Fang, X., Zhang, K., Jin, L., Hua, X., & Alder, A. C. (2020). Novel and legacy per-and polyfluoroalkyl substances (PFASs) in a farmland environment: Soil distribution and biomonitoring with plant leaves and locusts. Environmental Pollution, 263, 114487. https://doi.org/10.1016/j.envpol.2020.114487 source
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In the paper
“A review of the global occurrence of PFCs in water from wastewater treatment plants identified only two studies (included in previous reports from the EEAP) that had reported the presence of TFA [241].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [241] Lenka, S. P., Kah, M., & Padhye, L. P. (2021). A review of the occurrence, transformation, and removal of poly- and perfluoroalkyl substances (PFAS) in wastewater treatment plants. Water Research, 199, 117187. https://doi.org/10.1016/j.watres.2021.117187 source
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“Transport to the leaves was greater than to the stalk or the maize kernels.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [236] Lan, Z., Yao, Y., Xu, J., Chen, H., Ren, C., Fang, X., Zhang, K., Jin, L., Hua, X., & Alder, A. C. (2020). Novel and legacy per-and polyfluoroalkyl substances (PFASs) in a farmland environment: Soil distribution and biomonitoring with plant leaves and locusts. Environmental Pollution, 263, 114487. https://doi.org/10.1016/j.envpol.2020.114487 source
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“A recent laboratory study of degradation of PFCAs [240], has shown that exposure of PFCAs (see Table 2) to sodium hydroxide in a polar aprotic solvent (e.g., dimethyl sulfoxide) resulted in degradation to fluoride ions in yields between 78 and 100% in 24 h.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [240] Trang, B., Li, Y., Xue, X.-S., Ateia, M., Houk, K. N., & Dichtel, W. R. (2022). Low-temperature mineralization of perfluorocarboxylic acids. Science, 377(6608), 839–845. https://doi.org/10.1126/science.abm8868 source
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“When heated to 500 °C in the presence of air, PTFE, polychlorotrifluoroethylene (CPTFE), ethylene chlorotrifluoroethylene (ECTFE), and polytetrafluoroethylene-co-tetrafluoroethylene perfluoropropylether (PFEPE) yielded 7.8, 9.5, 6.3, and 2.5% TFA, respectively [238].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [238] Ellis, D. A., Mabury, S. A., Martin, J. W., & Muir, D. C. (2001). Thermolysis of fluoropolymers as a potential source of halogenated organic acids in the environment. Nature, 412, 321–324. https://doi.org/10.1038/35085548 source
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“as well as the relative proportion of anthropogenic sources related to the Montreal Protocol, compared to the other anthropogenic and natural sources”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“Current and predicted concentrations (to year 2100) of TFA in the oceans provide a large margin of exposure (thousand-fold) when compared to thresholds of toxicity.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
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In the paper
“This occurs via photo-dissociation of nitrogen dioxide (NO2) to NO and O, mainly by UV-A radiation, and subsequent reaction of the oxygen atom with molecular oxygen (Fig. 1).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Background: the UV photochemistry of tropospheric air
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In the paper
“Due to this autocatalytic production of O3 involving OH, the net production of O3 depends not only on UV-A radiation but also on UV-B radiation.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Background: the UV photochemistry of tropospheric air
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“Reductions in emissions of NOx and VOCs will be necessary to reverse the observed increasing trends, but any substantial future changes in UV radiation could modify the effectiveness of such reductions.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
hedgedconditional- Asserted: passes — The authors put it forward as true.
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In the paper
“Furthermore, recovery of stratospheric O3 is expected to increase the amount of O3 transported into the troposphere by meteorological processes that are sensitive to climate change.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Abstract
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In the paper
“Hydroxyl radicals control the atmospheric amounts of these chemicals as well as those of many other important trace gases, e.g., HFCs, HCFCs, HFOs, and very-short-lived substances (VSLSs, e.g., halo-organics with a lifetime of less than or equal to 6 months).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Background: the UV photochemistry of tropospheric air
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In the paper
“By limiting the depletion of stratospheric O3, the Montreal Protocol has avoided large increases in tropospheric UV radiation that would have exacerbated photochemical air pollution in urban areas.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Introduction
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In the paper
“UV radiation also generates hydroxyl radicals (OH) that control the amounts of many environmentally important chemicals in the atmosphere including some greenhouse gases, e.g., methane (CH4), and some short-lived ozone-depleting substances (ODSs).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Abstract
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In the paper
“The Montreal Protocol has prevented large increases in UV radiation that would have had major impacts on air quality.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Abstract
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“On the global scale, UV-B radiation (280–315 nm) controls the self-cleaning capacity of the troposphere by generating hydroxyl radicals (OH).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Introduction
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“Recent modeling studies have shown that the increases in UV radiation associated with the depletion of stratospheric ozone over 1980–2020 have contributed a small increase (~ 3%) to the globally averaged concentrations of OH.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Abstract
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“UV-B and UV-A radiation are together responsible for the net production of O3 in the troposphere.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Background: the UV photochemistry of tropospheric air
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“It is generally accepted that concentrations of O3 have increased throughout the global troposphere over the past century, due to increasing emissions of VOCs and NOx.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [11] Szopa, S., Naik, V., Adhikary, B., Artaxo, P., Berntsen, T., Collins, W. D., Fuzzi, S., Gallardo, L., Scharr, A. K., Klimont, Z., Liao, H., Unger, N., & Zanis, P. (2021). Short-lived climate forcers. In V. Masson-Delmotte, P. Zhai, A. Pirani, S. L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M. I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J. B. R. Matthews, T. K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, & B. Zhou (Eds.), Climate Change 2021: The physical science basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Chan
boosteddirect- Asserted: passes — The authors put it forward as true.
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In the paper
“The possibility that ground-level O3 can be affected by changes in UV related to depletion of stratospheric ozone was first pointed out by Liu and Trainer [12] and has since been confirmed by several studies using numerical models [13–17], as well as observations at the South Pole [18] and at mid-latitudes [19].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [12] Liu, S. C., & Trainer, M. (1988). Responses of the tropospheric ozone and odd hydrogen radicals to column ozone change. Journal of Atmospheric Chemistry, 6(3), 221–233. https://doi.org/10.1007/bf00053857 source
- Not checked yetcites [13] Thompson, A. M., Stewart, R. W., Owens, M. A., & Herwehe, J. A. (1989). Sensitivity of tropospheric oxidants to global chemical and climate change. Atmospheric Environment (1967), 23(3), 519–532. https://doi.org/10.1016/0004-6981(89)90001-2 source
- Not checked yetcites [14] Zhang, H., Wu, S., Huang, Y., & Wang, Y. (2014). Effects of stratospheric ozone recovery on photochemistry and ozone air quality in the troposphere. Atmospheric Chemistry and Physics, 14(8), 4079–4086. https://doi.org/10.5194/acp-14-4079-2014 source
- Not checked yetcites [15] Hodzic, A., & Madronich, S. (2018). Response of surface ozone over the continental United States to UV radiation declines from the expected recovery of stratospheric ozone. npj Climate and Atmospheric Science, 1(1), 35. https://doi.org/10.1038/s41612-018-0045-5 source
- Not checked yetcites [16] Bekki, S., Law, K. S., & Pyle, J. A. (1994). Effect of ozone depletion on atmospheric CH4 and CO concentrations. Nature, 371(6498), 595–597. https://doi.org/10.1038/371595a0 source
- Not checked yetcites [17] Fuglestved, J. S., Jonson, J. E., & Isaksen, I. S. A. (1994). Effects of reductions in stratospheric ozone on tropospheric chemistry through changes in photolysis rates. Tellus B: Chemical and Physical Meteorology, 46(3), 172–192. https://doi.org/10.3402/tellusb.v46i3.15790 source
- Not checked yetcites [18] Schnell, R. C., Liu, S. C., Oltmans, S. J., Stone, R. S., Hofmann, D. J., Dutton, E. G., Deshler, T., Sturges, W. T., Harder, J. W., Sewell, S. D., Trainer, M., & Harris, J. M. (1991). Decrease of summer tropospheric ozone concentrations in Antarctica. Nature, 351(6329), 726–729. https://doi.org/10.1038/351726a0 source
boostedconditional- Asserted: passes — The authors put it forward as true.
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In the paper
“Satellite-based observations of aerosol optical properties provide only very limited information about chemical composition [47, 48].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
What the sources say
- Not checked yetcites [47] Sowden, M., & Blake, D. (2021). Using infrared geostationary remote sensing to determine particulate matter ground-level composition and concentration. Air Quality, Atmosphere & Health. https://doi.org/10.1007/s11869-021-01061-3 source
- Not checked yetcites [48] Si, Y., Lu, Q., Zhang, X., Hu, X., Wang, F., Li, L., & Gu, S. (2021). A review of advances in the retrieval of aerosol properties by remote sensing multi-angle technology. Atmospheric Environment, 244, 117928. https://doi.org/10.1016/j.atmosenv.2020.117928 source
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“This would decrease tropospheric JO3 by about 14% (Box 2), like the changes used in the sensitivity calculation shown in Box 3.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
hedgeddirect- Asserted: passes — The authors put it forward as true.
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In the paper
“Considering that CCN are central to the lifecycle of clouds, this represents a newly recognized and potentially important dependence of the hydrological cycle (and climate in general) on UV radiation.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
hedgeddirect- Asserted: passes — The authors put it forward as true.
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In the paper
“These condensable gases are mostly produced by reactions of OH with pollutants such as SO2, NO2, or VOCs, to yield sulfate, nitrate, or secondary organic aerosols (SOA), respectively:”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“Quantification of these effects of UV radiation is still somewhat problematic because it involves complex chemical feedbacks that depend on specific physical and chemical variables, such as temperature, humidity, and the amounts of VOCs and NOx present.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“In most cases, the spectral dependence of these heterogeneous photo-processes is still unknown, so that it is not yet possible to assess reliably how much they would be influenced by changes in UV-B radiation resulting from changes in stratospheric ozone.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
plain- Asserted: passes — The authors put it forward as true.
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A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The Montreal Protocol, through its influence on the amount of UV radiation reaching the troposphere, has direct consequences for the formation of secondary PM.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
plaindirect- Asserted: passes — The authors put it forward as true.
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A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Primary PM, on the other hand, is not expected to depend strongly on UV irradiation.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“This is a result of the photo-degradation of DOM into hydrophilic low molecular weight chemicals, a process that has been reported in sunlit surface waters [75, 76].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
What the sources say
- Not checked yetcites [75] Erickson, D. J. I., Sulzberger, B., Zepp, R. G., & Austin, A. T. (2015). Effects of stratospheric ozone depletion, solar UV radiation, and climate change on biogeochemical cycling: interactions and feedbacks. Photochemical & Photobiological Sciences, 14(1), 127–148. https://doi.org/10.1039/C4PP90036G source
- Not checked yetcites [76] Sulzberger, B., Austin, A. T., Cory, R. M., Zepp, R. G., & Paul, N. D. (2019). Solar UV radiation in a changing world: roles of cryosphere–land–water–atmosphere interfaces in global biogeochemical cycles. Photochemical & Photobiological Sciences, 18(3), 747–774. https://doi.org/10.1039/C8PP90063A source
plaindirect- Asserted: passes — The authors put it forward as true.
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The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“A large fraction of PM2.5 is formed by UV-initiated photochemistry.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“and estimated that such increases in UV radiation would require an additional 10% reduction in VOC emissions to meet the same ground-level O3 concentrations had the UV remained constant.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [42] Ipiña, A., López-Padilla, G., Retama, A., Piacentini, R. D., & Madronich, S. (2021). Ultraviolet radiation environment of a tropical megacity in transition: Mexico City 2000–2019. Environmental Science & Technology. https://doi.org/10.1021/acs.est.0c08515 source
hedgeddirectSingle case- Asserted: passes — The authors put it forward as true.
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A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In summary, changes in UV radiation affect the formation, transformation, and destruction of PM.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“Under these scenarios, the changes in tropospheric O3 (urban declines and regional increases) would be about three times greater than those estimated for recovery limited to 1980 levels [14, 15].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [14] Zhang, H., Wu, S., Huang, Y., & Wang, Y. (2014). Effects of stratospheric ozone recovery on photochemistry and ozone air quality in the troposphere. Atmospheric Chemistry and Physics, 14(8), 4079–4086. https://doi.org/10.5194/acp-14-4079-2014 source
- Not checked yetcites [15] Hodzic, A., & Madronich, S. (2018). Response of surface ozone over the continental United States to UV radiation declines from the expected recovery of stratospheric ozone. npj Climate and Atmospheric Science, 1(1), 35. https://doi.org/10.1038/s41612-018-0045-5 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Globally, major contributors to PM2.5 are sulfate, nitrate, organics, ammonium, and black carbon (see Fig. 6.7 of IPCC 2021 [11]).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
What the sources say
- Not checked yetcites [11] Szopa, S., Naik, V., Adhikary, B., Artaxo, P., Berntsen, T., Collins, W. D., Fuzzi, S., Gallardo, L., Scharr, A. K., Klimont, Z., Liao, H., Unger, N., & Zanis, P. (2021). Short-lived climate forcers. In V. Masson-Delmotte, P. Zhai, A. Pirani, S. L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M. I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J. B. R. Matthews, T. K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, & B. Zhou (Eds.), Climate Change 2021: The physical science basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Chan
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Furthermore, UV radiation may make PM10 and PM2.5 more toxic by generating ROS (Sect. 2.3).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Current guidelines and standards for PM are based on the mass of PM2.5, without consideration of chemical composition of the particles.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“They estimated that, across the United States, for every 1 μg m−3 increase in PM2.5, 'there is an increase of 1.4 (95% CI 0.5–2.3) cardiovascular and respiratory deaths per 100,000 people.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [46] Pye, H. O. T., Ward-Caviness, C. K., Murphy, B. N., Appel, K. W., & Seltzer, K. M. (2021). Secondary organic aerosol association with cardiorespiratory disease mortality in the United States. Nature Communications, 12(1), 7215. https://doi.org/10.1038/s41467-021-27484-1 source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
None of the sources cited for this claim have been checked yet.
In the paper
“New studies, assessed here, indicate that even relatively low levels of pollution may be detrimental [80–82].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [80] Brauer, M., Brook, J. R., Christidis, T., Chu, Y., Crouse, D. L., Erickson, A., Hystad, P., Li, C., Martin, R. V., Meng, J., Pappin, A. J., Pinault, L. L., Tjepkema, M., van Donkelaar, A., Weichenthal, S., & Burnett, R. T. (2019). Mortality-air pollution associations in low-exposure environments (MAPLE): Phase 1. Research Reports: Health Effects Institute, 203, 1–87
- Not checked yetcites [81] Brunekreef, B., Strak, M., Chen, J., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bellander, T., Boutron-Ruault, M. C., Brandt, J., Carey, I., Cesaroni, G., Forastiere, F., Fecht, D., Gulliver, J., Hertel, O., Hoffmann, B., de Hoogh, K., Houthuijs, D., Hvidtfeldt, U. A., & Janssen, N. A. H., et al. (2021). Mortality and morbidity effects of long-term exposure to low-level PM2.5, BC, NO2, and O3: An analysis of European cohorts in the ELAPSE project (Vol. WA 754 R432 No. 208, HEI Report Series): Health Effects Institute
- Not checked yetcites [82] Dominici, F., Schwartz, J., Di, Q., Braun, D., Choirat, C., & Zanobetti, A. (Eds.). (2022). Assessing adverse health effects of long-term exposure to low levels of ambient air pollution: Phase 1 (2020/01/08 ed., Vol. 211, HEI Research Reports). Berlin: Health Effects Institute
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Liu and colleagues [95] analyzed the association between the incidence of asthma and low concentrations of air pollution using three large cohorts from Scandinavia (n = 98,326).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [95] Liu, S., Jørgensen, J. T., Ljungman, P., Pershagen, G., Bellander, T., Leander, K., Magnusson, P. K. E., Rizzuto, D., Hvidtfeldt, U. A., Raaschou-Nielsen, O., Wolf, K., Hoffmann, B., Brunekreef, B., Strak, M., Chen, J., Mehta, A., Atkinson, R. W., Bauwelinck, M., Varraso, R., Boutron-Ruault, M. C., et al. (2021). Long-term exposure to low-level air pollution and incidence of asthma: The ELAPSE project. European Respiratory Journal. https://doi.org/10.1183/13993003.03099-2020 source
plaincorrelationaln = 98,326- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Note that UV radiation is involved in the formation of many of these pollutants, including O3, NO2, and a large fraction of PM10 and PM2.5, including sulfate, nitrate, and secondary organic aerosols.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
In the paper
“These authors found that, during cold seasons, increased exposure to PM2.5 during the three days prior to the premature birth was associated with 5–6% increased odds of very-early pre-term birth (ORlag3 1.06, 95% CI 1.02–1.11).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [111] Costello, J. M., Steurer, M. A., Baer, R. J., Witte, J. S., & Jelliffe-Pawlowski, L. L. (2022). Residential particulate matter, proximity to major roads, traffic density and traffic volume as risk factors for preterm birth in California. Paediatric and Perinatal Epidemiology, 36(1), 70–79. https://doi.org/10.1111/ppe.12820 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The sensitivity appears much greater for OA, with increases of 1 μg m−3 leading to an increase of 8.1 (95% CI 5.4–11) cardiovascular and respiratory deaths per 100,000 people.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [46] Pye, H. O. T., Ward-Caviness, C. K., Murphy, B. N., Appel, K. W., & Seltzer, K. M. (2021). Secondary organic aerosol association with cardiorespiratory disease mortality in the United States. Nature Communications, 12(1), 7215. https://doi.org/10.1038/s41467-021-27484-1 source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“(c) long-term exposure last trimester: OR: 1.062, 95% CI 1.042–1.083;”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“and with exposure to NO2 HR = 1.019 (95% CI 1.012–1.026),”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [115] Shi, L., Steenland, K., Li, H., Liu, P., Zhang, Y., Lyles, R. H., Requia, W. J., Ilango, S. D., Chang, H. H., Wingo, T., Weber, R. J., & Schwartz, J. (2021). A national cohort study (2000–2018) of long-term air pollution exposure and incident dementia in older adults in the United States. Nature Communications, 12(1), 6754. https://doi.org/10.1038/s41467-021-27049-2 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“a 10 µg m−3 increase in PM2.5 for various durations of exposure was associated with an increased risk of having an infant born small for gestational age, (a) long-term exposure entire pregnancy OR: 1.151, 95% CI 1.104–1.200;”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Animal and epidemiological evidence demonstrates that air pollution may influence fertility.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [110] Wesselink, A. K., Wang, T. R., Ketzel, M., Mikkelsen, E. M., Brandt, J., Khan, J., Hertel, O., Laursen, A. S. D., Johannesen, B. R., Willis, M. D., Levy, J. I., Rothman, K. J., Sørensen, H. T., Wise, L. A., & Hatch, E. E. (2022). Air pollution and fecundability: Results from a Danish preconception cohort study. Pediatric and Perinatal Epidemiology, 36(1), 57–67. https://doi.org/10.1111/ppe.12832 source
boostedconditionaln = 10,183- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“the reductions in fecundability ratios from a one interquartile range (IQR) increase in PM2.5 (IQR = 3.2 µg m−3) and PM10 (IQR = 5.3 µg m−3) during each menstrual cycle were 0.93 (95% CI 0.87–0.99) and 0.91 (95% CI 0.84–0.99).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [110] Wesselink, A. K., Wang, T. R., Ketzel, M., Mikkelsen, E. M., Brandt, J., Khan, J., Hertel, O., Laursen, A. S. D., Johannesen, B. R., Willis, M. D., Levy, J. I., Rothman, K. J., Sørensen, H. T., Wise, L. A., & Hatch, E. E. (2022). Air pollution and fecundability: Results from a Danish preconception cohort study. Pediatric and Perinatal Epidemiology, 36(1), 57–67. https://doi.org/10.1111/ppe.12832 source
plaincorrelationaln = 10,183- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“the reductions in fecundability ratios from a one interquartile range (IQR) increase in PM2.5 (IQR = 3.2 µg m−3) and PM10 (IQR = 5.3 µg m−3) during each menstrual cycle were 0.93 (95% CI 0.87–0.99) and 0.91 (95% CI 0.84–0.99).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [110] Wesselink, A. K., Wang, T. R., Ketzel, M., Mikkelsen, E. M., Brandt, J., Khan, J., Hertel, O., Laursen, A. S. D., Johannesen, B. R., Willis, M. D., Levy, J. I., Rothman, K. J., Sørensen, H. T., Wise, L. A., & Hatch, E. E. (2022). Air pollution and fecundability: Results from a Danish preconception cohort study. Pediatric and Perinatal Epidemiology, 36(1), 57–67. https://doi.org/10.1111/ppe.12832 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“a 10-µg m−3 increase in PM2.5 for the third trimester was associated with an increased risk for hypertension during pregnancy OR: 2.177 95% 1.710–2.773.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“and particulate matter from diesel exhaust, aRR = 1.02 (95% CI 1.01–1.03).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [111] Costello, J. M., Steurer, M. A., Baer, R. J., Witte, J. S., & Jelliffe-Pawlowski, L. L. (2022). Residential particulate matter, proximity to major roads, traffic density and traffic volume as risk factors for preterm birth in California. Paediatric and Perinatal Epidemiology, 36(1), 70–79. https://doi.org/10.1111/ppe.12820 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The importance of secondary organic PM is consistent with a likely role of ROS in tissue damage (Sect. 2.3).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“a 13 µg m−3 increase in SO2, (24 h average) was associated with an increased risk of low birthweight OR: 1.035, 95% CI 1.031–1.049”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“(b) long-term exposure first trimester: OR: 1.074, 95% CI 1.046–1.103;”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In many locations (e.g., the contiguous United States, see Fig. 4), secondary aerosols may be the largest and the most detrimental fraction of PM2.5.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The interaction of temperature with PM10 was significant for cardiovascular causes of death for all ages (2.24% on days with low PM10 (95% CI 1.01–3.47), while it was 2.63% (95% CI 1.57–3.71) on days with high PM10.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [107] Analitis, A., De’ Donato, F., Scortichini, M., Lanki, T., Basagana, X., Ballester, F., Astrom, C., Paldy, A., Pascal, M., Gasparrini, A., Michelozzi, P., & Katsouyanni, K. (2018). Synergistic effects of ambient temperature and air pollution on health in Europe: Results from the PHASE Project. International Journal of Environmental Research and Public Health. https://doi.org/10.3390/ijerph15091856 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“A study from nine European cities by Analitis et al. [107] reported that the daily number of deaths increases by 2.20% (95% CI 1.28–3.13) on days with high O3 per 1 °C increase in temperature.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [107] Analitis, A., De’ Donato, F., Scortichini, M., Lanki, T., Basagana, X., Ballester, F., Astrom, C., Paldy, A., Pascal, M., Gasparrini, A., Michelozzi, P., & Katsouyanni, K. (2018). Synergistic effects of ambient temperature and air pollution on health in Europe: Results from the PHASE Project. International Journal of Environmental Research and Public Health. https://doi.org/10.3390/ijerph15091856 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The study identified 257,816 incident cases of dementia and found a positive association between an interquartile range (IQR) increase in PM2.5 of 4.8 µg m−3 and incidence of dementia, with a hazard ratio (HR) of 1.04 (95% CI 1.03–1.05)”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [114] Chen, H., Kwong, J. C., Copes, R., Hystad, P., van Donkelaar, A., Tu, K., Brook, J. R., Goldberg, M. S., Martin, R. V., Murray, B. J., Wilton, A. S., Kopp, A., & Burnett, R. T. (2017). Exposure to ambient air pollution and the incidence of dementia: A population-based cohort study. Environment International, 108, 271–277. https://doi.org/10.1016/j.envint.2017.08.020 source
plaincorrelationaln = 257,816- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The effects of ground-level O3 during high temperatures were similar [108].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [108] Areal, A. T., Zhao, Q., Wigmann, C., Schneider, A., & Schikowski, T. (2022). The effect of air pollution when modified by temperature on respiratory health outcomes: A systematic review and meta-analysis. Science of the Total Environment, 811, 152336. https://doi.org/10.1016/j.scitotenv.2021.152336 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The results of these new studies lend support to the theory that there is an association between air pollution and dementia and Alzheimer’s disease.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“A large Danish study investigated 10,183 participants between 2007 and 2018 [110] who were trying to conceive. The study showed that higher concentrations of PM10 and PM2.5 were associated with small reductions in fecundability”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [110] Wesselink, A. K., Wang, T. R., Ketzel, M., Mikkelsen, E. M., Brandt, J., Khan, J., Hertel, O., Laursen, A. S. D., Johannesen, B. R., Willis, M. D., Levy, J. I., Rothman, K. J., Sørensen, H. T., Wise, L. A., & Hatch, E. E. (2022). Air pollution and fecundability: Results from a Danish preconception cohort study. Pediatric and Perinatal Epidemiology, 36(1), 57–67. https://doi.org/10.1111/ppe.12832 source
plaincorrelationaln = 10,183- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In conclusion, early indications are that secondary aerosols, including SOA, may be particularly damaging.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Rests on an assumption: Secondary aerosols are generated by UV-driven photochemistry.
In the paper
“a 10 µg m−3 increase in PM10 (long-term exposure; mean difference 7.42 g, 95% CI 8.10–6.75;”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Subdivision of OA into primary and secondary types showed greater sensitivity for the latter, especially for PM formed by the OH-initiated oxidation of natural VOCs, such as isoprene and terpenes, commonly emitted by vegetation.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [46] Pye, H. O. T., Ward-Caviness, C. K., Murphy, B. N., Appel, K. W., & Seltzer, K. M. (2021). Secondary organic aerosol association with cardiorespiratory disease mortality in the United States. Nature Communications, 12(1), 7215. https://doi.org/10.1038/s41467-021-27484-1 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“This study found an increased risk of pre-term birth with higher concentrations of PM2.5 [adjusted relative risks (aRR) (per interquartile increase)] = 1.04, (95% CI 1.04–1.05)”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [111] Costello, J. M., Steurer, M. A., Baer, R. J., Witte, J. S., & Jelliffe-Pawlowski, L. L. (2022). Residential particulate matter, proximity to major roads, traffic density and traffic volume as risk factors for preterm birth in California. Paediatric and Perinatal Epidemiology, 36(1), 70–79. https://doi.org/10.1111/ppe.12820 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“and an IQR increase of 26.7 μg m−3 in NO2 HR = 1.10 (95% CI 1.08–1.12) over a 5-year period, respectively.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [114] Chen, H., Kwong, J. C., Copes, R., Hystad, P., van Donkelaar, A., Tu, K., Brook, J. R., Goldberg, M. S., Martin, R. V., Murray, B. J., Wilton, A. S., Kopp, A., & Burnett, R. T. (2017). Exposure to ambient air pollution and the incidence of dementia: A population-based cohort study. Environment International, 108, 271–277. https://doi.org/10.1016/j.envint.2017.08.020 source
plaincorrelationaln = 257,816- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Leaf-area was reduced by 21%, biomass of leaves by 14%, shoots by 23%, and roots by 17% [118].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [118] Li, C., Gu, X., Wu, Z., Qin, T., Guo, L., Wang, T., Zhang, L., & Jiang, G. (2021). Assessing the effects of elevated ozone on physiology, growth, yield and quality of soybean in the past 40 years: A meta-analysis. Ecotoxicology and Environmental Safety, 208, 111644. https://doi.org/10.1016/j.ecoenv.2020.111644 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“These were equivalent to annual losses of US$ 2.14, 1.32, 1.68, and 2.16 billion, respectively.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [122] Wang, T., Zhang, L., Zhou, S., Zhang, T., Zhai, S., Yang, Z., Wang, D., & Song, H. (2021). Effects of ground-level ozone pollution on yield and economic losses of winter wheat in Henan, China. Atmospheric Environment, 262, 118654. https://doi.org/10.1016/j.atmosenv.2021.118654 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Chronic exposure to O3 of about 150 μg m−3 caused a decrease in yield of seed by 28%.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [118] Li, C., Gu, X., Wu, Z., Qin, T., Guo, L., Wang, T., Zhang, L., & Jiang, G. (2021). Assessing the effects of elevated ozone on physiology, growth, yield and quality of soybean in the past 40 years: A meta-analysis. Ecotoxicology and Environmental Safety, 208, 111644. https://doi.org/10.1016/j.ecoenv.2020.111644 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“A study on the effects of O3 on trees in Mediterranean forests in Istria and Dalmatia showed that current levels cause inhibition of growth for two species of oak (Quercus pubescens and Q. ilex) as well as pine (Pinus nigra) [128].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [128] Jakovljevic, T., Lovreskov, L., Jelic, G., Anav, A., Popa, I., Fornasier, M. F., Proietti, C., Limic, I., Butorac, L., Vitale, M., & De Marco, A. (2021). Impact of ground-level ozone on Mediterranean forest ecosystems health. Science of the Total Environment, 783, 147063. https://doi.org/10.1016/j.scitotenv.2021.147063 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Leaf-area was reduced by 21%, biomass of leaves by 14%, shoots by 23%, and roots by 17% [118].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [118] Li, C., Gu, X., Wu, Z., Qin, T., Guo, L., Wang, T., Zhang, L., & Jiang, G. (2021). Assessing the effects of elevated ozone on physiology, growth, yield and quality of soybean in the past 40 years: A meta-analysis. Ecotoxicology and Environmental Safety, 208, 111644. https://doi.org/10.1016/j.ecoenv.2020.111644 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“This damage resulted in a 1.1% reduction in the profitable forest areas.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [127] Sacchelli, S., Carrari, E., Paoletti, E., Anav, A., Hoshika, Y., Sicard, P., Screpanti, A., Chirici, G., Cocozza, C., & De Marco, A. (2021). Economic impacts of ambient ozone pollution on wood production in Italy. Scientific Reports, 11(1), 1–9. https://doi.org/10.1038/s41598-020-80516-6 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Observations between 2015 and 2018 in the province of Henan in China [122] showed that annual losses in yield of wheat exposed to O3 at concentrations above 80 μg m−3 were 12.8, 8.9, 10.8, and 14.1%.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [122] Wang, T., Zhang, L., Zhou, S., Zhang, T., Zhai, S., Yang, Z., Wang, D., & Song, H. (2021). Effects of ground-level ozone pollution on yield and economic losses of winter wheat in Henan, China. Atmospheric Environment, 262, 118654. https://doi.org/10.1016/j.atmosenv.2021.118654 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“In an analysis of the impacts of O3 on production of forests in Italy, Sacchelli et al. [127] calculated that the average cost of potential O3 damage to forests in Italy in 2005 ranged from 31.6 to 57.1 million € (i.e., 10–17 € ha−1 year−1).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [127] Sacchelli, S., Carrari, E., Paoletti, E., Anav, A., Hoshika, Y., Sicard, P., Screpanti, A., Chirici, G., Cocozza, C., & De Marco, A. (2021). Economic impacts of ambient ozone pollution on wood production in Italy. Scientific Reports, 11(1), 1–9. https://doi.org/10.1038/s41598-020-80516-6 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“but super-recovery under some future climate scenarios could lead to larger increases (Sect. 2.2, and Box 1).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Leaf-area was reduced by 21%, biomass of leaves by 14%, shoots by 23%, and roots by 17% [118].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [118] Li, C., Gu, X., Wu, Z., Qin, T., Guo, L., Wang, T., Zhang, L., & Jiang, G. (2021). Assessing the effects of elevated ozone on physiology, growth, yield and quality of soybean in the past 40 years: A meta-analysis. Ecotoxicology and Environmental Safety, 208, 111644. https://doi.org/10.1016/j.ecoenv.2020.111644 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“For example, air pollutants can affect visual and chemical signals that mediate interaction between plants, and organisms that depend on plants or that are needed for the sustainability of plant communities [134]”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [134] Blande, J. D. (2021). Effects of air pollution on plant–insect interactions mediated by olfactory and visual cues. Current Opinion in Environmental Science & Health, 19, 100228. https://doi.org/10.1016/j.coesh.2020.100228 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“A study on the historical losses to air pollutants in maize and soybean grown in the United States showed that improvements in the control of O3, SO2, PM, and NO2 have improved yields by an average of 20% [121].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [121] Lobell, D. B., & Burney, J. A. (2021). Cleaner air has contributed one-fifth of US maize and soybean yield gains since 1999. Environmental Research Letters, 16(7), 074049. https://doi.org/10.1088/1748-9326/ac0fa4 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
None of the sources cited for this claim have been checked yet.
In the paper
“The recovery of stratospheric O3 to 1980 levels is expected to contribute 1–2 µg m−3 to ground-level O3 outside major urban areas [14, 15, 36]”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [14] Zhang, H., Wu, S., Huang, Y., & Wang, Y. (2014). Effects of stratospheric ozone recovery on photochemistry and ozone air quality in the troposphere. Atmospheric Chemistry and Physics, 14(8), 4079–4086. https://doi.org/10.5194/acp-14-4079-2014 source
- Not checked yetcites [15] Hodzic, A., & Madronich, S. (2018). Response of surface ozone over the continental United States to UV radiation declines from the expected recovery of stratospheric ozone. npj Climate and Atmospheric Science, 1(1), 35. https://doi.org/10.1038/s41612-018-0045-5 source
- Not checked yetcites [36] Hollaway, M., Wild, O., Yang, T., Sun, Y., Xu, W., Xie, C., Whalley, L., Slater, E., Heard, D., & Liu, D. (2019). Photochemical impacts of haze pollution in an urban environment. Atmospheric Chemistry and Physics, 19(15), 9699–9714. https://doi.org/10.5194/acp-19-9699-2019 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Effects were more severe in tests with soils of low fertility where production of seed and seed protein was reduced by 10% and 12%, respectively.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [119] Biancari, L., Cerrotta, C., Menéndez, A. I., Gundel, P. E., & Martínez-Ghersa, M. A. (2021). Episodes of high tropospheric ozone reduce nodulation, seed production and quality in soybean (Glycine max (L.) merr.) on low fertility soils. Environmental Pollution, 269, 116117. https://doi.org/10.1016/j.envpol.2020.116117 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“A separate modeling study estimated that current concentrations of O3 reduced yield by 6.9% for rice and 10.4% for wheat [124].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [124] Zhang, T., Yue, X., Unger, N., Feng, Z., Zheng, B., Li, T., Lei, Y., Zhou, H., Dong, X., & Liu, Y. (2021). Modeling the joint impacts of ozone and aerosols on crop yields in China: An air pollution policy scenario analysis. Atmospheric Environment, 247, 118216. https://doi.org/10.1016/j.atmosenv.2021.118216 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Overall, the improvement in yields was equivalent to ca US$ 5 billion.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [121] Lobell, D. B., & Burney, J. A. (2021). Cleaner air has contributed one-fifth of US maize and soybean yield gains since 1999. Environmental Research Letters, 16(7), 074049. https://doi.org/10.1088/1748-9326/ac0fa4 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“For example, tropospheric O3 can destroy or change biogenic volatile chemicals and, thus, interfere with attraction of pollinators or pests to plants [135].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [135] Masui, N., Agathokleous, E., Mochizuki, T., Tani, A., Matsuura, H., & Koike, T. (2021). Ozone disrupts the communication between plants and insects in urban and suburban areas: An updated insight on plant volatiles. Journal of Forest Research, 32, 1337–1349. https://doi.org/10.1007/s11676-020-01287-4 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“A climatological modeling study in European forests has shown that climate change has lengthened the growing season by ca 7 days decade−1 [129].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [129] Anav, A., De Marco, A., Friedlingstein, P., Savi, F., Sicard, P., Sitch, S., Vitale, M., & Paoletti, E. (2019). Growing season extension affects ozone uptake by European forests. Science of the Total Environment, 669, 1043–1052. https://doi.org/10.1016/j.scitotenv.2019.03.020 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“A modeling study on the effects of measured concentrations of O3 on grapes in the Demarcated Region of Douro in Portugal indicated that, in 2 years of high levels of O3, productivity of grapes was reduced by 27% and sugar content by 32% [125].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [125] Ascenso, A., Gama, C., Blanco-Ward, D., Monteiro, A., Silveira, C., Viceto, C., Rodrigues, V., Rocha, A., Borrego, C., & Lopes, M. (2021). Assessing Douro vineyards exposure to tropospheric ozone. Atmosphere, 12(2), 200. https://doi.org/10.3390/atmos12020200 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Of these pollutants, PM and NO2 appeared to cause more damage than O3 and SO2.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [121] Lobell, D. B., & Burney, J. A. (2021). Cleaner air has contributed one-fifth of US maize and soybean yield gains since 1999. Environmental Research Letters, 16(7), 074049. https://doi.org/10.1088/1748-9326/ac0fa4 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“These effects in soybean exposed to O3 at 160 μg m−3 for 7 days were linked to decreases in metabolism of carbon and capacity for detoxification in the roots of soybean [120].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [120] Tisdale, R. H., Zobel, R. W., & Burkey, K. O. (2021). Tropospheric ozone rapidly decreases root growth by altering carbon metabolism and detoxification capability in growing soybean roots. Science of the Total Environment, 766, 144292. https://doi.org/10.1016/j.scitotenv.2020.144292 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“A metanalysis of 48 studies on the exposure of soybeans to tropospheric O3 conducted between 1980 and 2019 showed increases in degradation of chlorophyll and foliar injury.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [118] Li, C., Gu, X., Wu, Z., Qin, T., Guo, L., Wang, T., Zhang, L., & Jiang, G. (2021). Assessing the effects of elevated ozone on physiology, growth, yield and quality of soybean in the past 40 years: A meta-analysis. Ecotoxicology and Environmental Safety, 208, 111644. https://doi.org/10.1016/j.ecoenv.2020.111644 source
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“Also, emissions of CO, the major sink of OH, may increase as a result of more frequent and longer lasting wildfires related to climate change.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
hedgedconditional- Asserted: passes — The authors put it forward as true.
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In the paper
“The drawback of this method is that the emissions (almost entirely anthropogenic) of CH3CCl3 have declined substantially in the last 30 years [145], thus affecting the accuracy and precision of derived amounts of global OH.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [145] Naus, S., Montzka, S. A., Patra, P. K., & Krol, M. C. (2021). A three-dimensional-model inversion of methyl chloroform to constrain the atmospheric oxidative capacity. Atmospheric Chemistry and Physics, 21(6), 4809–4824. https://doi.org/10.5194/acp-21-4809-2021 source
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“Total global emissions of CH4 are currently ~ 525 Tg year−1 [146].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [146] Worden, J. R., Cusworth, D. H., Qu, Z., Yin, Y., Zhang, Y., Bloom, A. A., Ma, S., Byrne, B. K., Scarpelli, T., Maasakkers, J. D., Crisp, D., Duren, R., & Jacob, D. J. (2022). The 2019 methane budget and uncertainties at 1° resolution and each country through Bayesian integration Of GOSAT total column methane data and a priori inventory estimates. Atmospheric Chemistry and Physics, 22(10), 6811–6841. https://doi.org/10.5194/acp-22-6811-2022 source
plain- Asserted: passes — The authors put it forward as true.
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A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“One reason for increases in atmospheric CH3Br concentrations during El Niño years (positive ONI) could be a global reduction in OH during El Niño years.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
hedgedconditional- Asserted: passes — The authors put it forward as true.
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In the paper
“In addition to NOx, also ODSs and factors underlying climate change such as rising water vapor have contributed to the net increase in modeled OH from 1980 to 2010.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [141] Stevenson, D. S., Zhao, A., Naik, V., O’Connor, F. M., Tilmes, S., Zeng, G., Murray, L. T., Collins, W. J., Griffiths, P. T., Shim, S. B., Horowitz, L. W., Sentman, L. T., & Emmons, L. (2020). Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP. Atmospheric Chemistry and Physics, 20(21), 12905–12920. https://doi.org/10.5194/acp-20-12905-2020 source
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“Increasing atmospheric CH4 was the main factor counteracting the trend of rising OH (by about − 8%, see Fig. 6) in this period.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [141] Stevenson, D. S., Zhao, A., Naik, V., O’Connor, F. M., Tilmes, S., Zeng, G., Murray, L. T., Collins, W. J., Griffiths, P. T., Shim, S. B., Horowitz, L. W., Sentman, L. T., & Emmons, L. (2020). Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP. Atmospheric Chemistry and Physics, 20(21), 12905–12920. https://doi.org/10.5194/acp-20-12905-2020 source
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“Nicewonger et al. [152] found a strong correlation between the interannual variability of CH3Br and the Oceanic Niño Index (ONI) from 1995 to 2020.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [152] Nicewonger, M. R., Saltzman, E. S., & Montzka, S. A. (2022). ENSO-driven fires cause large interannual variability in the naturally emitted, ozone-depleting trace gas CH3Br. Geophysical Research Letters, 49, e2021GL09475. https://doi.org/10.1029/2021GL094756 source
boostedcorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“Studies that infer concentrations of OH by the rate of removal of chemicals from the atmosphere have generally indicated a decreasing trend in OH after 2000 [144].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [144] Patra, P. K., Krol, M. C., Prinn, R. G., Takigawa, M., Mühle, J., Montzka, S. A., Lal, S., Yamashita, Y., Naus, S., Chandra, N., Weiss, R. F., Krummel, P. B., Fraser, P. J., O’Doherty, S., & Elkins, J. W. (2021). Methyl chloroform continues to constrain the hydroxyl (OH) variability in the troposphere. Journal of Geophysical Research-Atmospheres, 126(4), e2020JD033862. https://doi.org/10.1029/2020JD033862 source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“The contribution of BrVSLSs to the total stratospheric bromine loading was estimated to be ≈ 25% (in 2016) [150].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [150] Engel, A., Rigby, M., Burkholder, J. B., Fernandez, R. P., Froidevaux, L., Hall, B. D., Hossaini, R., Saito, T., Vollmer, M. K., & Yao, B. (2018). Update on Ozone-Depleting Substances (ODS) and Other Gases of Interest to the Montreal Protocol, Chap. 1. Scientific Assessment of Ozone Depletion: 2018, Global Ozone Research and Monitoring Project-Report No. 58, World Meteorological Organization. World Meteorological Organization, Geneva, Switzerland
hedged- Asserted: passes — The authors put it forward as true.
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A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Overall, these results indicate that aerosols and tropospheric O3 alone, or in combination, have adverse effects on plants and yields of crops.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
hedgeddirect- Asserted: passes — The authors put it forward as true.
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In the paper
“The mixing ratio of Br-VSLS at the tropopause has been measured to increase with latitude in the Northern Hemisphere, particularly during polar winter [149] when photochemically driven losses are smallest.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [149] Keber, T., Bonisch, H., Hartick, C., Hauck, M., Lefrancois, F., Obersteiner, F., Ringsdorf, A., Schohl, N., Schuck, T., Hossaini, R., Graf, P., Jockel, P., & Engel, A. (2020). Bromine from short-lived source gases in the extratropical northern hemispheric upper troposphere and lower stratosphere (UTLS). Atmospheric Chemistry and Physics, 20(7), 4105–4132. https://doi.org/10.5194/acp-20-4105-2020 source
plaindirect- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“A change in the average concentration of OH in the troposphere would have large impacts on the cleaning capacity of the troposphere.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
hedgeddirect- Asserted: passes — The authors put it forward as true.
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In the paper
“This results (via troposphere-to-stratosphere transport) in higher concentrations of Br-VLSLs in the extratropical lower stratosphere, as compared to those in the tropical lower stratosphere [149].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [149] Keber, T., Bonisch, H., Hartick, C., Hauck, M., Lefrancois, F., Obersteiner, F., Ringsdorf, A., Schohl, N., Schuck, T., Hossaini, R., Graf, P., Jockel, P., & Engel, A. (2020). Bromine from short-lived source gases in the extratropical northern hemispheric upper troposphere and lower stratosphere (UTLS). Atmospheric Chemistry and Physics, 20(7), 4105–4132. https://doi.org/10.5194/acp-20-4105-2020 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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None of the sources cited for this claim have been checked yet.
In the paper
“Global mean concentrations of tropospheric OH have been calculated to have changed little from 1850 to around 1980 [141, 142].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [141] Stevenson, D. S., Zhao, A., Naik, V., O’Connor, F. M., Tilmes, S., Zeng, G., Murray, L. T., Collins, W. J., Griffiths, P. T., Shim, S. B., Horowitz, L. W., Sentman, L. T., & Emmons, L. (2020). Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP. Atmospheric Chemistry and Physics, 20(21), 12905–12920. https://doi.org/10.5194/acp-20-12905-2020 source
- Not checked yetcites [142] Zhao, Y. H., Saunois, M., Bousquet, P., Lin, X., Berchet, A., Hegglin, M. I., Canadell, J. G., Jackson, R. B., Deushi, M., Jockel, P., Kinnison, D., Kirner, O., Strode, S., Tilmes, S., Dlugokencky, E. J., & Zheng, B. (2020). On the role of trend and variability in the hydroxyl radical (OH) in the global methane budget. Atmospheric Chemistry and Physics, 20(21), 13011–13022. https://doi.org/10.5194/acp-20-13011-2020 source
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“The interannual variability of atmospheric CH3Br concentrations cannot be solely explained by changes in the biological production of CH3Br due to changes in sea-surface temperatures (SSTs) and stratification [152].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [152] Nicewonger, M. R., Saltzman, E. S., & Montzka, S. A. (2022). ENSO-driven fires cause large interannual variability in the naturally emitted, ozone-depleting trace gas CH3Br. Geophysical Research Letters, 49, e2021GL09475. https://doi.org/10.1029/2021GL094756 source
plain- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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In the paper
“The losses due to both O3 and aerosols were estimated to be 11.3 for rice and 14.6% for wheat.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [124] Zhang, T., Yue, X., Unger, N., Feng, Z., Zheng, B., Li, T., Lei, Y., Zhou, H., Dong, X., & Liu, Y. (2021). Modeling the joint impacts of ozone and aerosols on crop yields in China: An air pollution policy scenario analysis. Atmospheric Environment, 247, 118216. https://doi.org/10.1016/j.atmosenv.2021.118216 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
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None of the sources cited for this claim have been checked yet.
In the paper
“Pollutants may also affect reproduction in plants by directly damaging air-borne pollen through stimulating repair mechanisms and redirecting resources to cell repair rather than reproduction [137, 138].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [137] Galveias, A., Arriegas, R., Mendes, S., Ribeiro, H., Abreu, I., Costa, A., & Antunes, C. (2021). Air pollutants NO2-and O3-induced Dactylis glomerata L. pollen oxidative defences and enhanced its allergenic potential. Aerobiologia, 37(1), 127–137. https://doi.org/10.1007/s10453-020-09676-2 source
- Not checked yetcites [138] Pereira, S., Fernández-González, M., Guedes, A., Abreu, I., & Ribeiro, H. (2021). The strong and the stronger: The effects of increasing ozone and nitrogen dioxide concentrations in pollen of different forest species. Forests, 12(1), 88. https://doi.org/10.3390/f12010088 source
hedgedconditional- Asserted: passes — The authors put it forward as true.
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In the paper
“According to the combined output of three computer models (Fig. 6), there was a net increase in OH of about 8% (mean value of the models).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [141] Stevenson, D. S., Zhao, A., Naik, V., O’Connor, F. M., Tilmes, S., Zeng, G., Murray, L. T., Collins, W. J., Griffiths, P. T., Shim, S. B., Horowitz, L. W., Sentman, L. T., & Emmons, L. (2020). Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP. Atmospheric Chemistry and Physics, 20(21), 12905–12920. https://doi.org/10.5194/acp-20-12905-2020 source
plain- Asserted: passes — The authors put it forward as true.
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- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“In addition, the allergenicity of pollen can be enhanced with implications for human health [137].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [137] Galveias, A., Arriegas, R., Mendes, S., Ribeiro, H., Abreu, I., Costa, A., & Antunes, C. (2021). Air pollutants NO2-and O3-induced Dactylis glomerata L. pollen oxidative defences and enhanced its allergenic potential. Aerobiologia, 37(1), 127–137. https://doi.org/10.1007/s10453-020-09676-2 source
plaindirect- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The amount of O3 transported from the stratosphere to the earth’s surface is likely to change due to human activities.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
hedgedconditional- Asserted: passes — The authors put it forward as true.
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In the paper
“Estimates using the output from seven atmospheric models and focusing primarily on RCP6.0, [161] suggest a 10–16% increase in the amount of O3 in the troposphere from STE in the twenty-first century.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [161] Abalos, M., Orbe, C., Kinnison, D. E., Plummer, D., Oman, L. D., Jöckel, P., Morgenstern, O., Garcia, R. R., Zeng, G., Stone, K. A., & Dameris, M. (2020). Future trends in stratosphere-to-troposphere transport in CCMI models. Atmospheric Chemistry and Physics, 20(11), 6883–6901. https://doi.org/10.5194/acp-20-6883-2020 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Another study using measurements of N2O to constrain the atmospheric modeling estimated an average decrease in STE due to the Antarctic ozone hole (1990–2017) of 30 Tg year−1 with a range of 5–55 Tg year−1, depending on year [157].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [157] Ruiz, D. J., & Prather, M. J. (2022). From the middle stratosphere to the surface, using nitrous oxide to constrain the stratosphere–troposphere exchange of ozone. Atmospheric Chemistry and Physics, 22(3), 2079–2093. https://doi.org/10.5194/acp-22-2079-2022 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The challenge in measuring and modeling STE of O3 is partially due to the mechanism by which the downward transport occurs.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
plainconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Recovery of stratospheric O3 because of decreasing release of ODSs would be expected to increase the amount of O3 transported into the troposphere.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“As a result, there is little information that can be used to constrain atmospheric models.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The modeling of the impact of STE on tropospheric O3 for the period 1850–2100 shows a significant decrease in O3 from the stratosphere by the year 2000 [158] (see Fig. 9).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [158] Griffiths, P. T., Murray, L. T., Zeng, G., Shin, Y. M., Abraham, N. L., Archibald, A. T., Deushi, M., Emmons, L. K., Galbally, I. E., Hassler, B., Horowitz, L. W., Keeble, J., Liu, J., Moeini, O., Naik, V., O’Connor, F. M., Oshima, N., Tarasick, D., Tilmes, S., Turnock, S. T., et al. (2021). Tropospheric ozone in CMIP6 simulations. Atmospheric Chemistry and Physics, 21(5), 4187–4218. https://doi.org/10.5194/acp-21-4187-2021 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Since UV-B radiation, together with tropospheric O3 and water vapor enhance the formation of OH, increased levels of UV-B radiation could counterbalance decreasing concentrations of OH due to wildfires and thawing of permafrost soils (Fig. 7).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
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- Based: passes — The paper gives a reason why it holds.
In the paper
“A comparison of measurements and 3 different models estimated the influence of stratospheric O3 on tropospheric O3, highlighting the challenges of obtaining consistent results [154].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [154] Williams, R. S., Hegglin, M. I., Kerridge, B. J., Jöckel, P., Latter, B. G., & Plummer, D. A. (2019). Characterising the seasonal and geographical variability in tropospheric ozone, stratospheric influence and recent changes. Atmospheric Chemistry and Physics, 19(6), 3589–3620. https://doi.org/10.5194/acp-19-3589-2019 source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Based on modeling studies for the period 1980 to 2010, Zhao et al. [142] found decreases in global concentrations of OH during El Niño years that were mainly driven by an elevated loss of OH via reaction with CO from enhanced burning of biomass (Fig. 7).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [142] Zhao, Y. H., Saunois, M., Bousquet, P., Lin, X., Berchet, A., Hegglin, M. I., Canadell, J. G., Jackson, R. B., Deushi, M., Jockel, P., Kinnison, D., Kirner, O., Strode, S., Tilmes, S., Dlugokencky, E. J., & Zheng, B. (2020). On the role of trend and variability in the hydroxyl radical (OH) in the global methane budget. Atmospheric Chemistry and Physics, 20(21), 13011–13022. https://doi.org/10.5194/acp-20-13011-2020 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“The modeling of STE is also hampered by the relatively few measurements of the chemical composition and physical structure of the atmosphere in the upper troposphere and lower stratosphere.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“A modeling study of tropopause folds for the period 1960–2100, using emissions as specified in RCP6.0 and including stratospheric O3 recovery, suggests that folds will increase during this period.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [165] Akritidis, D., Pozzer, A., & Zanis, P. (2019). On the impact of future climate change on tropopause folds and tropospheric ozone. Atmospheric Chemistry and Physics, 19(22), 14387–14401. https://doi.org/10.5194/acp-19-14387-2019 source
hedgedconditional- Asserted: passes — The authors put it forward as true.
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- Load-bearing: passes — The paper’s conclusions depend on it.
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In the paper
“This was found to vary between 10% year-round in the tropics increasing to greater than 50% at mid to high latitudes in winter.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [154] Williams, R. S., Hegglin, M. I., Kerridge, B. J., Jöckel, P., Latter, B. G., & Plummer, D. A. (2019). Characterising the seasonal and geographical variability in tropospheric ozone, stratospheric influence and recent changes. Atmospheric Chemistry and Physics, 19(6), 3589–3620. https://doi.org/10.5194/acp-19-3589-2019 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“For the period from 2000 to 2100, substantial increases in the amount of O3 transported from the stratosphere to the troposphere are predicted [158].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [158] Griffiths, P. T., Murray, L. T., Zeng, G., Shin, Y. M., Abraham, N. L., Archibald, A. T., Deushi, M., Emmons, L. K., Galbally, I. E., Hassler, B., Horowitz, L. W., Keeble, J., Liu, J., Moeini, O., Naik, V., O’Connor, F. M., Oshima, N., Tarasick, D., Tilmes, S., Turnock, S. T., et al. (2021). Tropospheric ozone in CMIP6 simulations. Atmospheric Chemistry and Physics, 21(5), 4187–4218. https://doi.org/10.5194/acp-21-4187-2021 source
plaindirect- Asserted: passes — The authors put it forward as true.
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- Load-bearing: passes — The paper’s conclusions depend on it.
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In the paper
“A modeling study focusing on the period 1980–2010 calculated a decrease in the transport of O3 from the stratosphere to the troposphere due to the impact of ODSs on stratospheric O3 [160].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [160] Griffiths, P. T., Keeble, J., Shin, Y. M., Abraham, N. L., Archibald, A. T., & Pyle, J. A. (2020). On the changing role of the stratosphere on the tropospheric ozone budget: 1979–2010. Geophysical Research Letters, 47, 9. https://doi.org/10.1029/2019gl086901 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Estimates of STE are poorly characterized by observations and atmospheric models.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [155] Archibald, A. T., Neu, J. L., Elshorbany, Y. F., Cooper, O. R., Young, P. J., Akiyoshi, H., Cox, R. A., Coyle, M., Derwent, R. G., Deushi, M., Finco, A., Frost, G. J., Galbally, I. E., Gerosa, G., Granier, C., Griffiths, P. T., Hossaini, R., Hu, L., Jöckel, P., Josse, B., et al. (2020). Tropospheric Ozone Assessment Report: A critical review of changes in the tropospheric ozone burden and budget from 1850 to 2100. Elementa Science of the Anthropocene, 8(1), 10. https://doi.org/10.1525/elementa.2020.034 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Statistically significant changes in the number of tropopause folds of around 3% have been identified in regions that coincide with a calculated increase of 6 µg m−3 in O3 near the Earth’s surface [165].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [165] Akritidis, D., Pozzer, A., & Zanis, P. (2019). On the impact of future climate change on tropopause folds and tropospheric ozone. Atmospheric Chemistry and Physics, 19(22), 14387–14401. https://doi.org/10.5194/acp-19-14387-2019 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The model estimated a 4% decrease (14 Tg O3) in global tropospheric O3 resulting from ODS up until 1994.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [160] Griffiths, P. T., Keeble, J., Shin, Y. M., Abraham, N. L., Archibald, A. T., & Pyle, J. A. (2020). On the changing role of the stratosphere on the tropospheric ozone budget: 1979–2010. Geophysical Research Letters, 47, 9. https://doi.org/10.1029/2019gl086901 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The longer the tropospheric lifetime of halogenated VSLSs, the higher is the probability that they reach the stratosphere and contribute to depletion of stratospheric O3 with impacts on ground-level UV-B radiation.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The net change in the concentration of O3 in the troposphere by 2100 is very dependent on the magnitude of anthropogenic emissions.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The equivalent effect is also observed in the Southern Hemisphere over the Indian and Southern Oceans.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [164] Dafka, S., Akritidis, D., Zanis, P., Pozzer, A., Xoplaki, E., Luterbacher, J., & Zerefos, C. (2021). On the link between the Etesian winds, tropopause folds and tropospheric ozone over the Eastern Mediterranean during summer. Atmospheric Research. https://doi.org/10.1016/j.atmosres.2020.105161 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, the impact also depends on the strength of the meteorology driving STE, which is sensitive to changes in climate.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
plainconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“For example, a likely consequence of the unprecedented Arctic stratospheric ozone depletion in spring 2020 was the heat wave in Siberia accompanied by wildfires in this region [179].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [179] Overland, J. E., & Wang, M. Y. (2021). The 2020 Siberian heat wave. [Article]. International Journal of Climatology, 41, E2341–E2346. https://doi.org/10.1002/joc.6850 source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Changes in stratospheric O3 concentrations, and thus in ground-level UV-B radiation, affect tropospheric air quality.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“For instance, the dominant atmospheric fate of CF3CClO and CF3CFO, generated in the atmospheric processing of HCFC-123 and HFC-134a, respectively, is uptake into cloud water, followed by effective hydrolysis to yield TFA, on a timescale of approximately 5–30 days [205].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Chemical pathways for degradation of precursors to trifluoroacetic acid
What the sources say
- Not checked yetcites [205] Wallington, T. J., Schneider, W. F., Worsnop, D. R., Nielsen, O. J., Sehested, J., Debruyn, W. J., & Shorter, J. A. (1994). The environmental impact of CFC replacements HFCs and HCFCs. Environmental Science & Technology, 28(7), 320A-326A. https://doi.org/10.1021/es00056a714 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The magnitude of these impacts will be altered by climate change and the future evolution of stratospheric O3.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“If the actual concentrations were less than the nominal value (239 ng TFA sodium salt L−1), the predicted values for 2100 would be smaller.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Contribution of chemicals under the purview of the Montreal Protocol to the global load of trifluoroacetic acid
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This transport is expected to increase because of the recovery of stratospheric O3 and changes in global circulation driven by climate change.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Conclusions
plainconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- The authors state this as an assumption: The ten-fold range used to estimate total oceanic TFA from measured concentrations is appropriate.
None of the sources cited for this claim have been checked yet.
In the paper
“Some of the degradation products are also atmospheric precursors of TFA through hydrolysis of acyl halides, e.g., CF3CFO, or via secondary photochemistry of trifluoroacetaldehyde (CF3CHO) [205, 206].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Chemical pathways for degradation of precursors to trifluoroacetic acid
What the sources say
- Not checked yetcites [205] Wallington, T. J., Schneider, W. F., Worsnop, D. R., Nielsen, O. J., Sehested, J., Debruyn, W. J., & Shorter, J. A. (1994). The environmental impact of CFC replacements HFCs and HCFCs. Environmental Science & Technology, 28(7), 320A-326A. https://doi.org/10.1021/es00056a714 source
- Not checked yetcites [206] Hurley, M. D., Wallington, T. J., Javadi, M. S., & Nielsen, O. J. (2008). Atmospheric chemistry of CF3CFCH2: Products and mechanisms of Cl atom and OH radical initiated oxidation. Chemical Physics Letters, 450(4–6), 263–267. https://doi.org/10.1016/j.cplett.2007.11.051 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“This aldehyde is the primary degradation product from several CFC replacements, including HCFCs, HFCs, HFOs and HCFOs, e.g., HCFC-234fb (CF3CH2CCl2F, τ = 45 years), HFC-143a (CF3CH3, τ = 51 years) and HFO-1234ze(E) (E-CF3CH = CHF, τ = 19 days) and HCFO-1233zd(E) (CF3CH = CHCl, τ = 42 days) [209].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Chemical pathways for degradation of precursors to trifluoroacetic acid
What the sources say
- Not checked yetcites [209] IPCC. (2021). Climate change 2021: The physical science basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“If the proportions of TFA from other refrigerants in Germany are applied to the global estimate of deposition, the maximum value for contributions from all refrigerants would be about 6% greater, i.e., 302 ng sodium salt L−1.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Contribution of chemicals under the purview of the Montreal Protocol to the global load of trifluoroacetic acid
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- The authors state this as an assumption: The proportions of TFA from other refrigerants in Germany can be applied to the global estimate of deposition.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Hence, UV-B radiation has some beneficial effects on tropospheric air quality.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Conclusions
plainconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Rests on an assumption: The total known use and release of HFC-134a, HFC-143a, and HFC-227ea between 1990 and 2015 is complete for calculating the theoretical maximum TFA production.
In the paper
“The HFOs will be degraded by tropospheric OH radicals closer to the source of release with resulting steeper gradients of concentration depending on wind direction and velocity [see examples of modeling of deposition in [217].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Contribution of chemicals under the purview of the Montreal Protocol to the global load of trifluoroacetic acid
What the sources say
- Not checked yetcites [217] David, L. M., Barth, M., Höglund-Isaksson, L., Purohit, P., Velders, G. J., Glaser, S., & Ravishankara, A. R. (2021). Trifluoroacetic acid deposition from emissions of HFO-1234yf in India, China, and the Middle East. Atmospheric Chemistry and Physics, 21(19), 14833–14849. https://doi.org/10.5194/acp-21-14833-2021 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“As a result of this uneven deposition, concentrations of TFA in surface waters will vary with flow rates and volumes of water.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Contribution of chemicals under the purview of the Montreal Protocol to the global load of trifluoroacetic acid
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“However, based on analyses in several oceanic basins, lesser amounts (a range of 61–205 × 106 tons equivalent to 45–152 ng L−1) were suggested by Scott et al. [227].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [227] Scott, B., Macdonald, R., Kannan, K., Fisk, A., Witter, A., Yamashita, N., Durham, L., Spencer, C., & Muir, D. (2005). Trifluoroacetate profiles in the Arctic, Atlantic, and Pacific oceans. Environmental Science & Technology, 39, 6555–6560. https://doi.org/10.1021/es047975u source
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Even with this assumption, this is equivalent to a discrepancy of 6 to 60-fold that is much larger than would be explainable by anthropogenic activity in relation to use of the HFCs.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- The authors state this as an assumption: The ten-fold range used to estimate total oceanic TFA from measured concentrations is appropriate.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This gap is most likely from natural sources.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“In a study of the concentrations of PFAS in the serum of staff and support workers in Nankai University in Tianjin (China), a location where fluorochemicals are manufactured, TFA and other PFAS were detected [242].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [242] Duan, Y., Sun, H., Yao, Y., Meng, Y., & Li, Y. (2020). Distribution of novel and legacy per-/polyfluoroalkyl substances in serum and its associations with two glycemic biomarkers among Chinese adult men and women with normal blood glucose levels. Environment International, 134, 105295. https://doi.org/10.1016/j.envint.2019.105295 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Measurements of TFA in barley have not yet been reported in the literature but uptake of TFA from soil into maize kernels (discussed above) resulted in accumulations with a range of 40,400 to 102,000 ng a.e. kg−1 [236].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [236] Lan, Z., Yao, Y., Xu, J., Chen, H., Ren, C., Fang, X., Zhang, K., Jin, L., Hua, X., & Alder, A. C. (2020). Novel and legacy per-and polyfluoroalkyl substances (PFASs) in a farmland environment: Soil distribution and biomonitoring with plant leaves and locusts. Environmental Pollution, 263, 114487. https://doi.org/10.1016/j.envpol.2020.114487 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Given the high solubility in water as noted above (and low Kow, Table 2), this concentration is likely equivalent to a systemic burden of the same values in ng kg−1.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Concentrations of other PFAS were much smaller [245].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [245] Wang, B., Yao, Y., Wang, Y., Chen, H., & Sun, H. (2021). Per-and polyfluoroalkyl substances in outdoor and indoor dust from Mainland China: Contributions of unknown precursors and implications for human exposure. Environmental Science & Technology, 56(10), 6036–6045. https://doi.org/10.1021/acs.est.0c08242 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The 95th centile estimated daily intakes of TFA for toddlers and adults were 5.3 and 0.55 ng a.e. kg−1 body weight, respectively, for indoor dust.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [245] Wang, B., Yao, Y., Wang, Y., Chen, H., & Sun, H. (2021). Per-and polyfluoroalkyl substances in outdoor and indoor dust from Mainland China: Contributions of unknown precursors and implications for human exposure. Environmental Science & Technology, 56(10), 6036–6045. https://doi.org/10.1021/acs.est.0c08242 source
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The 95th centile estimated daily intakes for toddlers and adults from outdoor dust were 3.2 and 0.33 ng a.e. kg−1 body weight.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [245] Wang, B., Yao, Y., Wang, Y., Chen, H., & Sun, H. (2021). Per-and polyfluoroalkyl substances in outdoor and indoor dust from Mainland China: Contributions of unknown precursors and implications for human exposure. Environmental Science & Technology, 56(10), 6036–6045. https://doi.org/10.1021/acs.est.0c08242 source
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Residues of TFA (and other PFAS) have now been detected in indoor and outdoor dust in China [245].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [245] Wang, B., Yao, Y., Wang, Y., Chen, H., & Sun, H. (2021). Per-and polyfluoroalkyl substances in outdoor and indoor dust from Mainland China: Contributions of unknown precursors and implications for human exposure. Environmental Science & Technology, 56(10), 6036–6045. https://doi.org/10.1021/acs.est.0c08242 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The large concentrations of TFA found in the environments around factories and plants manufacturing fluorinated chemicals indicate large fugitive emissions from some facilities that manufacture these chemicals.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
None of the sources cited for this claim have been checked yet.
In the paper
“Anesthesia using halothane can result in significant levels of TFA in blood (20,000–110,000 µg L−1), which is excreted in urine [250–253].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [250] Morio, M., Fujii, K., Takiyama, R., Chikasue, F., Kikuchi, H., & Ribarić, L. (1980). Quantitative analysis of trifluoroacetate in the urine and blood by isotachophoresis. Anesthesiology, 53(1), 56–59. https://doi.org/10.1097/00000542-198007000-00011 source
- Not checked yetcites [251] Mirkov, M. I., Morio, M., Kawahara, M., Yuge, O., Kinoshita, H., & Fujii, K. (1988). Excretion of trifluoroacetic acid as a metabolite of halothane in digestive juices. Journal of Anesthesia, 2(2), 133–138. https://doi.org/10.1007/s0054080020133 source
- Not checked yetcites [252] Sutton, T. S., Koblin, D. D., Gruenke, L. D., Weiskopf, R. B., Rampil, I. J., Waskell, L., & Eger, E., 2nd. (1991). Fluoride metabolites after prolonged exposure of volunteers and patients to desflurane. Anesthesia and Analgesia, 73(2), 180–185. https://doi.org/10.1213/00000539-199108000-00011 source
- Not checked yetcites [253] Wark, H., Earl, J., Chau, D. D., & Overton, J. (1990). Halothane metabolism in children. British Journal of Anaesthesia, 64, 474–481. https://doi.org/10.1093/bja/64.4.474 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“When these polymers are subjected to high temperatures, they can degrade to yield TFA or precursors of TFA [238].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [238] Ellis, D. A., Mabury, S. A., Martin, J. W., & Muir, D. C. (2001). Thermolysis of fluoropolymers as a potential source of halogenated organic acids in the environment. Nature, 412, 321–324. https://doi.org/10.1038/35085548 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Analysis of samples of beer from 23 countries spanning the globe provided a range of concentrations with a median of 6100 ng L−1 and a maximum of 51,000 ng a.e. L−1.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [243] Scheurer, M., & Nödler, K. (2021). Ultrashort-chain perfluoroalkyl substance trifluoroacetate (TFA) in beer and tea–An unintended aqueous extraction. Food Chemistry, 351, 129304. https://doi.org/10.1016/j.foodchem.2021.129304 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“In urban sites, concentrations of TFA in indoor dust from six locations in China ranged from 117,000 to 470,000 µg a.e. kg−1.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [245] Wang, B., Yao, Y., Wang, Y., Chen, H., & Sun, H. (2021). Per-and polyfluoroalkyl substances in outdoor and indoor dust from Mainland China: Contributions of unknown precursors and implications for human exposure. Environmental Science & Technology, 56(10), 6036–6045. https://doi.org/10.1021/acs.est.0c08242 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Residues of TFA have been found in beverages such as beer and herbal infusions (teas) [243].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [243] Scheurer, M., & Nödler, K. (2021). Ultrashort-chain perfluoroalkyl substance trifluoroacetate (TFA) in beer and tea–An unintended aqueous extraction. Food Chemistry, 351, 129304. https://doi.org/10.1016/j.foodchem.2021.129304 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The stability of TFA and its salts indicates a half-life >> 6 months”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Human and environmental risks associated with trifluoroacetic acid in the environment
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
In the paper
“A no observed effect concentration (NOEC) of 2.5 mg a.e. L−1 (2,500,000 ng L−1) was reported based on inhibition of growth.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Human and environmental risks associated with trifluoroacetic acid in the environment
What the sources say
- Not checked yetcites [192] Chabot, L. (2017). ALGA, GROWTH INHIBITION TEST Effect of the trifuoroacetic acid on the growth of the unicellular alga Pseudokirchneriella subcapitata, according to OECD guideline 201 (Study conducted for RHODIA OPERATIONS – SOLVAY). Vol. 17-005-167094. Verneuil-En-Halatte
plainSingle case- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“With the transition from HFCs to third-generation alternatives such as HFO-1234ze(E) and HCFO-1233zd(E), the atmospheric abundance of CF3CHO, (estimated 40° latitude, annually averaged diurnal tropospheric lifetime of ≤ 2 days [210]) is expected to increase in source regions.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other issues relevant to the degradation of fluorinated chemicals and release of TFA
What the sources say
- Not checked yetcites [210] Chiappero, M. S., Malanca, F. E., Argüello, G. A., Wooldridge, S. T., Hurley, M. D., Ball, J. C., Wallington, T. J., Waterland, R. L., & Buck, R. C. (2006). Atmospheric chemistry of perfluoroaldehydes (CxF2x+1CHO) and fluorotelomer aldehydes (CxF2x+1CH2CHO): Quantification of the important role of photolysis. The Journal of Physical Chemistry A, 110(43), 11944–11953. https://doi.org/10.1021/jp064262k source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“In another study, yields of TFA from photolysis of the penoxsulam (an herbicide) and sulfoxaflor (an insecticide) exposed to UV radiation in river water were less than 5% under laboratory conditions [256].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [256] Bhat, A. P., Pomerantz, W. C. K., & Arnold, W. A. (2022). Finding fluorine: Photoproduct formation during the photolysis of fluorinated pesticides. Environmental Science & Technology, 56(17), 12336–12346. https://doi.org/10.1021/acs.est.2c04242 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Nevertheless, CF3CHO is likely to be only a minor source of TFA.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“but present substantial dangers given the widespread vulnerability of humans to, e.g., photochemical smog”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Rests on an assumption: Poor air quality remains a major health problem globally, despite progress in reducing anthropogenic emissions of air pollutants.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Due to the fast photolysis of CF3CHO, concentrations of CF3CHO are unlikely to build up to ng m−3 levels, locally or globally.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other issues relevant to the degradation of fluorinated chemicals and release of TFA
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, preliminary estimates of possible releases from use of pesticides in the United States and Germany suggest that total amounts are less than those from HCFCs, HFCs, and HFOs.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The reaction of OH radicals with the hydrated form of CF3CHO in the gas phase is known to be an effective route for formation of TFA (100%) [211]”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other issues relevant to the degradation of fluorinated chemicals and release of TFA
What the sources say
- Not checked yetcites [211] Sulbaek Andersen, M. P., Toft, A., Nielsen, O. J., Hurley, M. D., Wallington, T. J., Chishima, H., Tonokura, K., Mabury, S. A., Martin, J. W., & Ellis, D. A. (2006). Atmospheric chemistry of perfluorinated aldehyde hydrates (n-CxF2x+1CH(OH)2, x= 1, 3, 4): Hydration, dehydration, and kinetics and mechanism of Cl atom and OH radical initiated oxidation. The Journal of Physical Chemistry A, 110(32), 9854–9860. https://doi.org/10.1021/jp060404z source
boosteddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“It is clear from the above, that the small increases in tropospheric ozone formation generated from a transition from HFC emissions to emissions of HFOs would not be of concern.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other issues relevant to the degradation of fluorinated chemicals and release of TFA
boosted- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“TFA released into the environment will eventually collect in terminal basins such as endorheic lakes or the oceans.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“One source of TFA in the environment is the degradation of replacements for chemicals that contribute to the destruction of stratospheric O3. These are the HCFCs, HFCs, and HFOs, all of which are replacements for chemicals that fall under the purview of the Montreal Protocol.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Many of the common HFOs, with some exceptions, have POCP values that lie between those for methane (0.57/0.22) and ethane (10.91/4.52).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other issues relevant to the degradation of fluorinated chemicals and release of TFA
What the sources say
- Not checked yetcites [268] Jenkin, M. E., Derwent, R. G., & Wallington, T. J. (2017). Photochemical ozone creation potentials for volatile organic compounds: Rationalization and estimation. Atmospheric Environment, 163, 128–137. https://doi.org/10.1016/j.atmosenv.2017.05.024 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The concentrations of TFA in beer and tea discussed above are small when compared to the NOED of TFA in mammals. This indicates that the risk to humans from residues of TFA in beer and tea are de minimis (of little importance).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Human and environmental risks associated with trifluoroacetic acid in the environment
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“however, in comparison to future loads of TFA resulting from the release of chemicals under the purview of the Montreal Protocol, the potential contribution from pesticides is small.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Other than precipitation, which contains TFA formed in the atmosphere, the sources for TFA in surface waters are uncertain.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“some of which can undergo degradation in the atmosphere to give TFA in various yields”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“In a second study with exposures for 14, 28, and 90 days to 0, 600, 1200, and 2400 mg TFA a.e. L−1, no significant effects on ALT were observed.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Human and environmental risks associated with trifluoroacetic acid in the environment
What the sources say
- Not checked yetcites [260] UBA. (2019). Ableitung Eines Gesundheitlichen Leitwertes für Trifluoressigsäure (TFA). Umwelt Bundesampt
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“The dominant overall sink for CF3CHO is thought to be photolysis [210].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other issues relevant to the degradation of fluorinated chemicals and release of TFA
What the sources say
- Not checked yetcites [210] Chiappero, M. S., Malanca, F. E., Argüello, G. A., Wooldridge, S. T., Hurley, M. D., Ball, J. C., Wallington, T. J., Waterland, R. L., & Buck, R. C. (2006). Atmospheric chemistry of perfluoroaldehydes (CxF2x+1CHO) and fluorotelomer aldehydes (CxF2x+1CH2CHO): Quantification of the important role of photolysis. The Journal of Physical Chemistry A, 110(43), 11944–11953. https://doi.org/10.1021/jp064262k source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“and accumulates in surface and ground waters”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“UV-B radiation has positive and negative impacts on tropospheric air quality.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“but is also essential for removing pollutants from the atmosphere”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Thus, changes in UV-B radiation have consequences for both air quality and the lifetime of many gases, including some GHGs and VSLSs.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This reported effect does not change the conclusion that TFA is of low toxicity in mammals.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Human and environmental risks associated with trifluoroacetic acid in the environment
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Rests on an assumption: Increases in the activity of enzymes in or originating from the liver are considered as compensatory unless accompanied by physiological responses such as loss of weight.
In the paper
“For example, ozonation (4 mg L−1) of solutions of trembotrione (mesotrione, CAS# 104,206-82-8), flufenacet (CAS# 142,459-58-3), flurtamone (CAS# 96,525-23-4), and fluopyram (CAS# 658,066–35-4) at 100 µg L−1 for times between 5 and 60 min resulted in 5, 20, 43, and 32% production of TFA on a molar basis [Fig. 7 in 202].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [202] Scheurer, M., Nödler, K., Freeling, F., Janda, J., Happel, O., Riegel, M., Müller, U., Storck, F. R., Fleig, M., Lange, F. T., Brunsch, A., & Brauch, H.-J. (2017). Small, mobile, persistent: Trifluoroacetate in the water cycle—Overlooked sources, pathways, and consequences for drinking water supply. Water Research, 126, 460–471. https://doi.org/10.1016/j.watres.2017.09.045 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Probably not a substantial claim. 80
- It may state two separate claims as one. 138
- The quote only partly states this claim. 3
The cited sources support only part of this claim — read each source’s verdict below.
In the paper
“There is also growing evidence that exposure to air pollutants maybe detrimental to the central nervous system and contribute to deficits in cognitive development, neurodegenerative diseases and dementia [112, 113].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [112] Tham, R., & Schikowski, T. (2021). The role of traffic-related air pollution on neurodegenerative diseases in older people: An epidemiological perspective. Journal of Alzheimer’s Disease, 79(3), 949–959. https://doi.org/10.3233/jad-200813 source
- Partly supportedcites [113] Weuve, J., Bennett, E. E., Ranker, L., Gianattasio, K. Z., Pedde, M., Adar, S. D., Yanosky, J. D., & Power, M. C. (2021). Exposure to air pollution in relation to risk of dementia and related outcomes: An updated systematic review of the epidemiological literature. Environmental Health Perspectives, 129(9), 96001. https://doi.org/10.1289/EHP8716 sourceExperimental — accuracy not yet measured
The Introduction and Conclusions describe growing evidence that air pollution may affect late-life cognitive health and dementia-related outcomes. The review does not establish deficits in cognitive development or address neurodegenerative diseases broadly; it notes that other reviews extended to additional neurodegenerative conditions. No page numbers were provided for these passages. (LLM, conf=0.88)
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
The cited sources support only part of this claim — read each source’s verdict below.
In the paper
“Accordingly, people with cardiovascular diseases are more likely to suffer a heart attack, stroke, or death when exposed to air pollution [109].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Partly supportedcites [109] Rajagopalan, S., Al-Kindi, S. G., & Brook, R. D. (2018). Air pollution and cardiovascular disease: JACC state-of-the-art review. Journal of the American College of Cardiologists, 72(17), 2054–2070. https://doi.org/10.1016/j.jacc.2018.07.099 sourceExperimental — accuracy not yet measured
The Myocardial Infarction section says patients with underlying coronary artery disease may be at particularly high risk of an acute coronary event during PM2.5 exposure, and that long-term survival after acute coronary syndrome is reduced by long-term exposure. The Cerebrovascular Disease section links air pollution to stroke and stroke mortality, but does not establish that people with pre-existing cardiovascular disease specifically have a higher stroke risk. (LLM, conf=0.86)
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
- Partly supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“Also, physiological responses to damage from O3 might alter the ratios of pigments in plants, the phenology (seasonal development) of flowers and whole plants [136], or the time of flowering, thus affecting host recognition and pollinators.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Supportedcites [136] Duque, L., Poelman, E. H., & Steffan-Dewenter, I. (2021). Effects of ozone stress on flowering phenology, plant-pollinator interactions and plant reproductive success. Environmental Pollution, 272, 115953. https://doi.org/10.1016/j.envpol.2020.115953 source
The citation is attached to the claim about phenology. The Results report that ozone accelerated flowering onset in the autumn experiments, and the Abstract describes ozone-exposed plants’ phenological development and a tendency toward reduced vegetative growth. The Discussion explains how a shift in flowering time might affect pollinators. (LLM, conf=0.88)
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
- Supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“Global emissions of NOx peaked around 2012, followed by reductions [143].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Supportedcites [143] McDuffie, E. E., Smith, S. J., O’Rourke, P., Tibrewal, K., Venkataraman, C., Marais, E. A., Zheng, B., Crippa, M., Brauer, M., & Martin, R. V. (2020). A global anthropogenic emission inventory of atmospheric pollutants from sector- And fuel-specific sources (1970–2017): An application of the Community Emissions Data System (CEDS). Earth System Science Data, 12(4), 3413–3442. https://doi.org/10.5194/essd-12-3413-2020 source
Section 3.2, “Historical trends in annual global emissions,” states that global NOx emissions peaked between 2011 and 2013 and then decreased by 7% by 2017. That supports the claim’s approximate peak year and subsequent reductions. (LLM, conf=0.95)
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
- Supported
In the paper
“Over the past few decades, concentrations of O3 at ground-level and in the lower atmosphere have been generally decreasing in most developed countries, while increasing greatly in some locations including East and South Asia, in response to changes in emissions of NOx and VOCs.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [11] Szopa, S., Naik, V., Adhikary, B., Artaxo, P., Berntsen, T., Collins, W. D., Fuzzi, S., Gallardo, L., Scharr, A. K., Klimont, Z., Liao, H., Unger, N., & Zanis, P. (2021). Short-lived climate forcers. In V. Masson-Delmotte, P. Zhai, A. Pirani, S. L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M. I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J. B. R. Matthews, T. K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, & B. Zhou (Eds.), Climate Change 2021: The physical science basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Chan
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“For example, increasing trends in UV radiation over 1996–2016 were found [41] for stations in Japan and Greece, and were attributed to reductions in absorbing aerosols.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [41] Fountoulakis, I., Zerefos, C. S., Bais, A. F., Kapsomenakis, J., Koukouli, M.-E., Ohkawara, N., Fioletov, V., De Backer, H., Lakkala, K., Karppinen, T., & Webb, A. R. (2018). Twenty-five years of spectral UV-B measurements over Canada, Europe and Japan: Trends and effects from changes in ozone, aerosols, clouds, and surface reflectivity. Comptes Rendus de l’Academie d’Geoscience de France, 350(7), 393–402. https://doi.org/10.1016/j.crte.2018.07.011 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“This has led to surface brightening (e.g., by 0.70–1.16 W m−2 year−1 in eastern China over 2014–2019) [29] but also to undesirable increases in ambient O3 [30–33] (e.g., by 2–6 µg m−3 year−1 in megacity clusters of Beijing and Shanghai over 2013–2017) [34].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [29] Shi, H., Zhang, J., Zhao, B., Xia, X., Hu, B., Chen, H., Wei, J., Liu, M., Bian, Y., Fu, D., Gu, Y., & Liou, K.-N. (2021). Surface brightening in Eastern and Central China since the implementation of the Clean Air Action in 2013: Causes and implications. Geophysical Research Letters, 48(3), e2020GL091105. https://doi.org/10.1029/2020GL091105 source
- Not checked yetcites [30] Ma, M., Gao, Y., Wang, Y., Zhang, S., Leung, L. R., Liu, C., Wang, S., Zhao, B., Chang, X., Su, H., Zhang, T., Sheng, L., Yao, X., & Gao, H. (2019). Substantial ozone enhancement over the North China Plain from increased biogenic emissions due to heat waves and land cover in summer 2017. Atmospheric Chemistry and Physics, 19(19), 12195–12207. https://doi.org/10.5194/acp-19-12195-2019 source
- Not checked yetcites [31] Wang, W., Li, X., Shao, M., Hu, M., Zeng, L., Wu, Y., & Tan, T. (2019). The impact of aerosols on photolysis frequencies and ozone production in Beijing during the 4-year period 2012–2015. Atmospheric Chemistry and Physics, 19(14), 9413–9429. https://doi.org/10.5194/acp-19-9413-2019 source
- Not checked yetcites [32] Wang, Y., Gao, W., Wang, S., Song, T., Gong, Z., Ji, D., Wang, L., Liu, Z., Tang, G., Huo, Y., Tian, S., Li, J., Li, M., Yang, Y., Chu, B., Petaja, T., Kerminen, V. M., He, H., Hao, J., Kulmala, M., et al. (2020). Contrasting trends of PM2.5 and surface-ozone concentrations in China from 2013 to 2017. National Science Review, 7, 1331–1339. https://doi.org/10.1093/nsr/nwaa032 source
- Not checked yetcites [33] Wu, J., Bei, N., Hu, B., Liu, S., Wang, Y., Shen, Z., Li, X., Liu, L., Wang, R., Liu, Z., Cao, J., Tie, X., Molina, L. T., & Li, G. (2020). Aerosol-photolysis interaction reduces particulate matter during wintertime haze events. Proceedings of the National Academy of Sciences of the United States of America, 117(18), 9755–9761. https://doi.org/10.1073/pnas.1916775117 source
- Not checked yetcites [34] Li, K., Jacob, D. J., Liao, H., Shen, L., Zhang, Q., & Bates, K. H. (2019). Anthropogenic drivers of 2013–2017 trends in summer surface ozone in China. Proceedings of the National Academy of Sciences of the United States of America, 116(2), 422–427. https://doi.org/10.1073/pnas.1812168116 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“For the contiguous United States (Fig. 4) modeling studies indicate that more than half of the PM2.5 is secondary in origin, and thus directly sensitive to variations in UV radiation [46].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
What the sources say
- Not checked yetcites [46] Pye, H. O. T., Ward-Caviness, C. K., Murphy, B. N., Appel, K. W., & Seltzer, K. M. (2021). Secondary organic aerosol association with cardiorespiratory disease mortality in the United States. Nature Communications, 12(1), 7215. https://doi.org/10.1038/s41467-021-27484-1 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“An umbrella review (a review of systematic reviews and meta-analyses) [79] evaluated 548 meta-analyses derived from 75 systematic reviews on non-region-specific associations between outdoor air pollution and human health.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Of these meta-analyses, 57% (313) were not statistically significant.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [79] Markozannes, G., Pantavou, K., Rizos, E. C., Sindosi, O., Tagkas, C., Seyfried, M., Saldanha, I. J., Hatzianastassiou, N., Nikolopoulos, G. K., & Ntzani, E. (2022). Outdoor air quality and human health: An overview of reviews of observational studies. Environmental Pollution, 306, 119309. https://doi.org/10.1016/j.envpol.2022.119309 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“These values are somewhat higher than the values reviewed in our previous assessment, which ranged from 1.75 to 4.3 million depending on year and source of estimates [6].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [6] Wilson, S. R., Madronich, S., Longstreth, J. D., & Solomon, K. R. (2019). Interactive effects of changing stratospheric ozone and climate on tropospheric composition and air quality, and the consequences for human and ecosystem health. Photochemical & Photobiological Sciences, 18, 775–803. https://doi.org/10.1039/c8pp90064g source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“They found a hazard ratio of 1.22 (95% CI 1.04–1.43) per 5 µg m−3 increase in PM2.5, 1.17 (95% CI 1.10–1.25) per 10 µg m−3 for NO2 and 1.15 (95% CI 1.08–1.23) per 0.5 × 10–5 m−1 for BC.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [95] Liu, S., Jørgensen, J. T., Ljungman, P., Pershagen, G., Bellander, T., Leander, K., Magnusson, P. K. E., Rizzuto, D., Hvidtfeldt, U. A., Raaschou-Nielsen, O., Wolf, K., Hoffmann, B., Brunekreef, B., Strak, M., Chen, J., Mehta, A., Atkinson, R. W., Bauwelinck, M., Varraso, R., Boutron-Ruault, M. C., et al. (2021). Long-term exposure to low-level air pollution and incidence of asthma: The ELAPSE project. European Respiratory Journal. https://doi.org/10.1183/13993003.03099-2020 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The combined Hazard Ratios (HRs) for natural-cause mortality were 1.08 (95% CI 1.06, 1.09) per 10 µg m−3 increase in PM2.5, and 1.04 (95% CI 1.03, 1.06) per 10 µg m−3 increase in PM10.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [96] Chen, J., & Hoek, G. (2020). Long-term exposure to PM and all-cause and cause-specific mortality: A systematic review and meta-analysis. Environment International, 143, 105974. https://doi.org/10.1016/j.envint.2020.105974 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“These studies have consistently shown that the adverse effects of air pollution are not limited to high exposures; harmful health effects can be observed at very low concentrations (see below), with no observable thresholds below which exposure can be considered safe.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [80] Brauer, M., Brook, J. R., Christidis, T., Chu, Y., Crouse, D. L., Erickson, A., Hystad, P., Li, C., Martin, R. V., Meng, J., Pappin, A. J., Pinault, L. L., Tjepkema, M., van Donkelaar, A., Weichenthal, S., & Burnett, R. T. (2019). Mortality-air pollution associations in low-exposure environments (MAPLE): Phase 1. Research Reports: Health Effects Institute, 203, 1–87
- Not checked yetcites [81] Brunekreef, B., Strak, M., Chen, J., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bellander, T., Boutron-Ruault, M. C., Brandt, J., Carey, I., Cesaroni, G., Forastiere, F., Fecht, D., Gulliver, J., Hertel, O., Hoffmann, B., de Hoogh, K., Houthuijs, D., Hvidtfeldt, U. A., & Janssen, N. A. H., et al. (2021). Mortality and morbidity effects of long-term exposure to low-level PM2.5, BC, NO2, and O3: An analysis of European cohorts in the ELAPSE project (Vol. WA 754 R432 No. 208, HEI Report Series): Health Effects Institute
- Not checked yetcites [82] Dominici, F., Schwartz, J., Di, Q., Braun, D., Choirat, C., & Zanobetti, A. (Eds.). (2022). Assessing adverse health effects of long-term exposure to low levels of ambient air pollution: Phase 1 (2020/01/08 ed., Vol. 211, HEI Research Reports). Berlin: Health Effects Institute
boosteddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Almost all participants had annual average exposures below the European Union guidance values (Table 1) for PM2.5 and NO2, and about 14% had mean annual exposures below the United States National Ambient Air Quality Standards for PM2.5 (12 µg m−3).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [81] Brunekreef, B., Strak, M., Chen, J., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bellander, T., Boutron-Ruault, M. C., Brandt, J., Carey, I., Cesaroni, G., Forastiere, F., Fecht, D., Gulliver, J., Hertel, O., Hoffmann, B., de Hoogh, K., Houthuijs, D., Hvidtfeldt, U. A., & Janssen, N. A. H., et al. (2021). Mortality and morbidity effects of long-term exposure to low-level PM2.5, BC, NO2, and O3: An analysis of European cohorts in the ELAPSE project (Vol. WA 754 R432 No. 208, HEI Report Series): Health Effects Institute
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“The study followed 325,367 adults and found significant positive associations between even low exposure to PM2.5, BC, and NO2 and mortality from natural-causes as well as cause-specific mortality such as cardiovascular and ischemic heart disease, cerebrovascular disease, respiratory disease, COPD, diabetes, cardiometabolic disease, and lung cancer mortality [91].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [91] Strak, M., Weinmayr, G., Rodopoulou, S., Chen, J., de Hoogh, K., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bekkevold, T., Bellander, T., Boutron-Ruault, M. C., Brandt, J., Cesaroni, G., Concin, H., Fecht, D., Forastiere, F., Gulliver, J., Hertel, O., Hoffmann, B., Hvidtfeldt, U. A., et al. (2021). Long term exposure to low level air pollution and mortality in eight European cohorts within the ELAPSE project: Pooled analysis. British Medical Journal, 374, n1904. https://doi.org/10.1136/bmj.n1904 source
plaincorrelationaln = 325,367- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“In the case of HFO-1234yf, no significant competition exists in the degradation pathway, and the expected yield of TFA is ~ 100% through the hydrolysis of CF3CFO.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Chemical pathways for degradation of precursors to trifluoroacetic acid
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The worst-case annual formation of TFA from refrigerant R134a was estimated at 1050 tons year−1, 1170 tons year−1 from refrigerant R1234yf, and 141 tons year−1 from all other refrigerants.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Contribution of chemicals under the purview of the Montreal Protocol to the global load of trifluoroacetic acid
What the sources say
- Not checked yetcites [214] UBA. (2021). Persistent degradation products of halogenated refrigerants and blowing agents in the environment: Type, environmental concentrations, and fate with particular regard to new halogenated substitutes with low global warming potential (Vol. FB000452/ENG). Umwelt Bundesamt
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Given current global CH4 emission of ~ 500 Tg year−1, a 1% decrease of the global OH concentration would result in an increase of ~ 1% in tropospheric CH4 concentrations, equivalent to a sustained increase in emissions of CH4 of ~ 5 Tg year−1.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Conclusions
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
It may state two separate claims as one.
- The authors state this as an assumption: The degradation half-life of TFA in the environment is very long (approximately centuries).
In the paper
“The likelihood of wildfires is increasing globally, a trend that is expected to continue [176].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [176] Jia, G., Shevliakova, E., Artaxo, P., Noblet-Ducoudré, N. D., Houghton, R., House, J., Kitajima, K., Lennard, C., Popp, A., Sirin, A., Sukumar, R., & Verchot, L. (2019). Land–climate interactions. In: P. R. Shukla, J. Skea, E. C. Buendia, V. Masson-Delmotte, H.-O. Pörtner, D. C. Roberts, P. Zhai, R. Slade, S. Connors, R. v. Diemen, M. Ferrat, E. Haughey, S. Luz, S. Neogi, M. Pathak, J. Petzold, J. P. Pereira, P. Vyas, E. Huntley, et al. (Eds.), Climate Change and Land: an IPCC special report on climate change, desertification, land degradation, sustainable land management, food security, and g
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Consequences are colder than normal surface temperatures in southeastern Europe and southern Asia, but warmer than normal surface temperatures in Western Europe, Russia, and northern Asia [178].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [178] Friedel, M., Chiodo, G., Stenke, A., Domeisen, D. I. V., Fueglistaler, S., Anet, J. G., & Peter, T. (2022). Springtime arctic ozone depletion forces northern hemisphere climate anomalies. Nature Geoscience, 15(7), 541–547. https://doi.org/10.1038/s41561-022-00974-7 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“The severe fire season in Australia 2019–2020 led to significant degradation of air quality within Australia and a smoke plume that was traced around the globe [173–175].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [173] Santee, M. L., Lambert, A., Manney, G. L., Livesey, N. J., Froidevaux, L., Neu, J. L., Schwartz, M. J., Millán, L. F., Werner, F., Read, W. G., Park, M., Fuller, R. A., & Ward, B. M. (2022). Prolonged and pervasive perturbations in the composition of the southern hemisphere midlatitude lower stratosphere from the Australian New Year’s fires. Geophysical Research Letters, 49(4), e2021GL096270. https://doi.org/10.1029/2021GL096270 source
- Not checked yetcites [174] Tencé, F., Jumelet, J., Bekki, S., Khaykin, S., Sarkissian, A., & Keckhut, P. (2022). Australian black summer smoke observed by lidar at the French Antarctic station Dumont d’Urville. Journal of Geophysical Research: Atmospheres, 127(4), e2021JD035349. https://doi.org/10.1029/2021JD035349 source
- Not checked yetcites [175] NASA Goddard Space Flight Center. (2021). Global Transport of Australian Bushfire Smoke. https://climate.nasa.gov/climate_resources/202/global-transport-of-australian-bushfire-smoke/. Accessed 16 Mar 2022
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“Well- and tap-water had concentrations of about 250 ng a.e. L−1.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [234] Xie, G., Zhai, Z., & Zhang, J. (2020). Distribution characteristics of trifluoroacetic acid in the environments surrounding fluorochemical production plants in Jinan, China. Environmental Science and Pollution Research, 27, 983–991. https://doi.org/10.1007/s11356-019-06689-4 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“However, the amounts generated from the oxidation of HFOs represent only a small (< 0.5%) contribution to the formation of acid rain in comparison to other sources such as sulfur and nitrogen oxides [223] and this is judged to not be of concern.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Trifluoroacetic acid in precipitation
What the sources say
- Not checked yetcites [223] Lindley, A., McCulloch, A., & Vink, T. (2019). Contribution of hydrofluorocarbons (HFCs) and hydrofluoro-olefins (HFOs) atmospheric breakdown products to acidification (“Acid Rain”) in the EU at present and in the future. Open Journal of Air Pollution, 8, 81–95. https://doi.org/10.4236/ojap.2019.84004 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“In the same study, concentrations of TFA in soil samples close to factories ranged from 59 to 2081 ng a.e. kg−1.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [234] Xie, G., Zhai, Z., & Zhang, J. (2020). Distribution characteristics of trifluoroacetic acid in the environments surrounding fluorochemical production plants in Jinan, China. Environmental Science and Pollution Research, 27, 983–991. https://doi.org/10.1007/s11356-019-06689-4 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“TFA was detected in samples of surface water and soils near a fluorochemical complex in Jinan (China) [234].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [234] Xie, G., Zhai, Z., & Zhang, J. (2020). Distribution characteristics of trifluoroacetic acid in the environments surrounding fluorochemical production plants in Jinan, China. Environmental Science and Pollution Research, 27, 983–991. https://doi.org/10.1007/s11356-019-06689-4 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Uptake of TFA from nutrient solution (containing 2,000,000,000 ng a.e. L−1) by roots and leaves of wheat plants resulted in accumulated concentrations 170,000,000 ng kg−1 in roots and 100,000,000 ng kg−1 in shoots after exposure for 80 h [235].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [235] Zhang, L., Sun, H., Wang, Q., Chen, H., Yao, Y., Zhao, Z., & Alder, A. C. (2019). Uptake mechanisms of perfluoroalkyl acids with different carbon chain lengths (C2–C8) by wheat (Triticum aestivum L.). Science of the Total Environment, 654, 19–27. https://doi.org/10.1016/j.scitotenv.2018.10.443 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Concentration of TFA in lotic (flowing) surface waters ranged from 300 to 1000 ng L−1 but two lentic (still water sites) had mean concentrations of 1700 and 2600 ng a.e. L−1.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [234] Xie, G., Zhai, Z., & Zhang, J. (2020). Distribution characteristics of trifluoroacetic acid in the environments surrounding fluorochemical production plants in Jinan, China. Environmental Science and Pollution Research, 27, 983–991. https://doi.org/10.1007/s11356-019-06689-4 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Greatest amounts of TFA (60,000 and 50,000 ng a.e. L−1) were measured in leachates from two incineration plants, although leachates from one landfill and one transfer-site had similarly high concentrations approaching 40,000 ng a.e. L−1.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [233] Wang, B., Yao, Y., Chen, H., Chang, S., Tian, Y., & Sun, H. (2020). Per-and polyfluoroalkyl substances and the contribution of unknown precursors and short-chain (C2–C3) perfluoroalkyl carboxylic acids at solid waste disposal facilities. Science of the Total Environment, 705, 135832. https://doi.org/10.1016/j.scitotenv.2019.135832 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Concentrations ranged from a low of 9.1 to a high of 320 ng TFA a.e. L−1 and fluxes from 160 to 16,000 ng TFA a.e. m−2 day−1 (Tables SI-7 and SI-8 in [219]).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Trifluoroacetic acid in precipitation
What the sources say
- Not checked yetcites [219] Chen, H., Zhang, L., Li, M., Yao, Y., Zhao, Z., Munoz, G., & Sun, H. (2019). Per-and polyfluoroalkyl substances (PFASs) in precipitation from mainland China: Contributions of unknown precursors and short-chain (C2C3) perfluoroalkyl carboxylic acids. Water Research, 153, 169–177. https://doi.org/10.1016/j.watres.2019.01.019 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“TFA was formed in amounts of 19–39 mol% for PFCAs with 5–9 carbon chains.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [240] Trang, B., Li, Y., Xue, X.-S., Ateia, M., Houk, K. N., & Dichtel, W. R. (2022). Low-temperature mineralization of perfluorocarboxylic acids. Science, 377(6608), 839–845. https://doi.org/10.1126/science.abm8868 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“A similar study on this source of TFA in Beijing (China) indicated yields of TFA from thermolysis of PTFE, poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP), and poly(vinylidene fluoride-co-chlorotrifluoroethylene) (PVDF-CTFE) were 1.2%, 0.9% and 0.3%, respectively, which was estimated to contribute 0.6–6.1 ng a.e. L−1 to precipitation over this city [239].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [239] Cui, J. N., Guo, J. Y., Zhai, Z. H., & Zhang, J. B. (2019). The contribution of fluoropolymer thermolysis to trifluoroacetic acid (TFA) in environmental media. Chemosphere, 222, 637–644. https://doi.org/10.1016/j.chemosphere.2019.01.174 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“When these authors fed maize leaves to herbivores (locusts) the leaf-to-locust transfer factors were < 1 (0.028–0.185), indicative of negative trophic magnification (trophic dilution), most likely because locusts can excrete TFA, as has been demonstrated in mammals [201].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [201] Boutonnet, J. C., Bingham, P., Calamari, D., Rooij, Cd., Franklin, J., Kawano, T., Libre, J.-M., McCul-Loch, A., Malinverno, G., & Odom, J. M. (1999). Environmental risk assessment of trifluoroacetic acid. Human and Ecological Risk Assessment, 5, 59–124. https://doi.org/10.1080/10807039991289644 source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Total | | | | | 122,604”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. The quote only partly states this claim.
- The authors state this as an assumption: The actual yield of TFA from pesticides is dependent on other substituents on the molecule and the primary driver(s) of degradation, so the calculated yields based on molecular weight ratios are conservative.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“There is some uncertainty in toxicity values because of the limited number of marine species tested.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“At present, there are large uncertainties associated with the concentrations of TFA in various environmental compartments in some regions”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. The paper may give no reason why it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“UV-B radiation is responsible for the formation of the OH radical, the major oxidizing agent in the troposphere.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Background: the UV photochemistry of tropospheric air
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The Montreal Protocol has maintained the troposphere’s self-cleaning capacity at near natural levels, but future changes remain a concern, especially if the intensity of UV-B radiation decreases substantially due to increasing stratospheric ozone under some future scenarios.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Introduction
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“One such product, trifluoroacetic acid (TFA), has no obvious pathway of degradation and might accumulate in some water bodies, but is unlikely to cause adverse effects out to 2100.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Abstract
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. The paper may give no reason why it holds. It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Replacements for ODSs include chemicals that react with OH radicals, hence preventing the transport of these chemicals to the stratosphere.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Abstract
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“when it was shown that ambient O3 was generated by UV-induced reactions involving nitrogen oxides (NOx) and volatile organic compounds (VOCs) [7].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere
What the sources say
- Not checked yetcites [7] Haagen-Smit, A. J., Bradley, C. E., & Fox, M. M. (1953). Ozone formation in photochemical oxidation of organic substances. Industrial & Engineering Chemistry, 45(9), 2086–2089. https://doi.org/10.1021/ie50525a044 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Conversely, reductions in UV radiation decrease chemical reactivity, causing slower production of O3 and other photochemical pollutants near source regions, e.g., urban areas, while slowing the destruction on regional and global scales.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Future scenarios in which stratospheric O3 returns to 1980 values or even exceeds them (the so-called super-recovery) will tend to ameliorate urban ground-level O3 slightly but worsen it in rural areas.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Abstract
plainconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Ground-level O3 and PM are detrimental to human health, leading to several million premature deaths per year globally, and have adverse effects on plants and the yields of crops.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Abstract
What the sources say
- Not checked yetcites [77] WHO. (2022). Air Pollution. https://www.who.int/health-topics/air-pollution#tab=tab_1. Accessed Apr 2022
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“For the United States, the recovery to 1980 levels will increase the O3 column by 4–6%, and the resulting lower levels of UV radiation will tend to lower ambient O3 over a few large urban areas, while raising it slightly elsewhere, consistent with an overall slower chemical reactivity.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“These radicals react with many chemicals emitted to the troposphere, including greenhouse gases such as methane, facilitating their removal from the atmosphere and essentially determining their atmospheric lifetime.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Introduction
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“However, their atmospheric photo-degradation can lead to persistent secondary pollutants such as trifluoroacetic acid (TFA), whose ultimate fate in the environment remains unclear, requiring continued monitoring and assessment relative to other natural and/or anthropogenic sources.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Introduction
plaindirect- Asserted: passes — The authors put it forward as true.
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Probably not a substantial claim. The paper’s conclusions may not depend on it.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“such as the central role of UV-generated OH radicals in controlling the overall reactivity; and the formation of O3, peroxides, acids, and other harmful gaseous intermediates, including some that can condense to form particulate matter (PM).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere
plaindirect- Asserted: passes — The authors put it forward as true.
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Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“Future projections tend to show an increasing global burden of tropospheric O3, although the details depend on the assumed scenario of greenhouse gas emissions (only one shown in the figure, SSP370).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [11] Szopa, S., Naik, V., Adhikary, B., Artaxo, P., Berntsen, T., Collins, W. D., Fuzzi, S., Gallardo, L., Scharr, A. K., Klimont, Z., Liao, H., Unger, N., & Zanis, P. (2021). Short-lived climate forcers. In V. Masson-Delmotte, P. Zhai, A. Pirani, S. L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M. I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J. B. R. Matthews, T. K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, & B. Zhou (Eds.), Climate Change 2021: The physical science basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Chan
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
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It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Hydroxyl radicals are lost by reaction with reduced chemicals, including carbon monoxide (CO), methane (CH4), VOCs, sulfur dioxide (SO2), and nitrogen dioxide (NO2) (Fig. 1).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Background: the UV photochemistry of tropospheric air
plaindirect- Asserted: passes — The authors put it forward as true.
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Probably not a substantial claim. The paper’s conclusions may not depend on it.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“This occurs through the photolysis of O3 and subsequent reaction of an electronically excited oxygen atom with water (H2O).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Background: the UV photochemistry of tropospheric air
plaindirect- Asserted: passes — The authors put it forward as true.
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Probably not a substantial claim. The paper’s conclusions may not depend on it.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Ultraviolet (UV) radiation drives the net production of tropospheric ozone (O3) and a large fraction of particulate matter (PM) including sulfate, nitrate, and secondary organic aerosols.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Abstract
plaindirect- Asserted: passes — The authors put it forward as true.
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The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“More intense UV-B irradiation generally induces faster chemical reactivity in air parcels (Box 1), leading to faster removal of primary chemicals, but also more rapid and intense build up (and removal) of intermediate or secondary pollutants, such as hetero-organics (e.g., aldehydes, ketones, and organic nitrates) and other by-products including O3, peroxides, and secondary PM.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
plaindirect- Asserted: passes — The authors put it forward as true.
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The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Most ground-level O3 is produced by the UV photochemical processing of pollutants (see Sect. 2.1), with occasional contributions from downward transport of ozone-rich stratospheric air (see Sect. 2.7).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
plaindirect- Asserted: passes — The authors put it forward as true.
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It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Actions under the Montreal Protocol have led to the introduction of new chemicals to the atmosphere as replacements to some of the ozone-depleting substances, including hydrofluorochlorocarbons (HCFCs), hydrofluorocarbons (HFCs), hydrofluoroethers (HFEs), hydrofluoroolefins (HFOs) and hydrochlorofluoroolefins (HCFOs).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Introduction
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“Nitrogen oxides (NOx = NO + NO2) are emitted primarily as NO, and the NO2 is produced via the re-cycling of the hydroxyl radical (OH) generated from the UV-B photolysis of O3.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Background: the UV photochemistry of tropospheric air
plaindirect- Asserted: passes — The authors put it forward as true.
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It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Chemicals such as chlorofluorocarbons (CFCs) that do not react with OH have the potential to reach the stratosphere in large amounts; the CFCs were, therefore, replaced with chemicals that react with OH (HCFCs, HFCs, HFOs, etc.).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Background: the UV photochemistry of tropospheric air
plaindirect- Asserted: passes — The authors put it forward as true.
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- Load-bearing: fails — The paper’s conclusions may not depend on it.
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Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Ultraviolet-induced photo-processes within and on the surface of aerosols can also increase the ability of aerosols to act as cloud condensation nuclei (CCN) [73, 74], which can change cloud properties and therefore indirectly impact climate.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
What the sources say
- Not checked yetcites [73] Borduas-Dedekind, N., Ossola, R., David, R. O., Boynton, L. S., Weichlinger, V., Kanji, Z. A., & McNeill, K. (2019). Photomineralization mechanism changes the ability of dissolved organic matter to activate cloud droplets and to nucleate ice crystals. Atmospheric Chemistry and Physics, 19(19), 12397–12412. https://doi.org/10.5194/acp-19-12397-2019 source
- Not checked yetcites [74] Borduas-Dedekind, N., Nizkorodov, S., & McNeill, K. (2020). UVB-irradiated laboratory-generated secondary organic aerosol extracts have increased cloud condensation nuclei abilities: Comparison with dissolved organic matter and implications for the photomineralization mechanism. Chimia (Aarau), 74(3), 142–148. https://doi.org/10.2533/chimia.2020.142 source
plaindirect- Asserted: passes — The authors put it forward as true.
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It may state two separate claims as one.
In the paper
“Thus, the World Health Organization (WHO) estimates that 4.2 million deaths every year occur because of exposure to ambient (outdoor) air pollution which includes particulates and gases, such as O3, NOx, etc. [77].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [77] WHO. (2022). Air Pollution. https://www.who.int/health-topics/air-pollution#tab=tab_1. Accessed Apr 2022
hedgeddirect- Asserted: passes — The authors put it forward as true.
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Probably not a substantial claim. The paper’s conclusions may not depend on it.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Even at current levels (see Figs. 2 and 3), ground-level O3 damages vegetation and causes economically significant reductions in crop yields (see Sects. 2.4 and 2.5).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, despite this uncertainty, even small changes in UV radiation should be of concern, because of the large number of people currently exposed to poor air quality and its significance to human health.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
plain- Asserted: passes — The authors put it forward as true.
- Checkable: fails — It may be too vague to check against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. It may be too vague to check against evidence.
None of the sources cited for this claim have been checked yet.
In the paper
“Simulations with numerical models show several possible reasons including increases in UV radiation [31, 33–39], shifts in the VOC/NOx chemical regime resulting in increased production of O3 efficiency [35, 40], higher emissions of biogenic VOC due to rising temperatures [30], and decreased competition for gas-phase radicals by aerosol surfaces [34, 40], with reality likely being a combination of”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [31] Wang, W., Li, X., Shao, M., Hu, M., Zeng, L., Wu, Y., & Tan, T. (2019). The impact of aerosols on photolysis frequencies and ozone production in Beijing during the 4-year period 2012–2015. Atmospheric Chemistry and Physics, 19(14), 9413–9429. https://doi.org/10.5194/acp-19-9413-2019 source
- Not checked yetcites [33] Wu, J., Bei, N., Hu, B., Liu, S., Wang, Y., Shen, Z., Li, X., Liu, L., Wang, R., Liu, Z., Cao, J., Tie, X., Molina, L. T., & Li, G. (2020). Aerosol-photolysis interaction reduces particulate matter during wintertime haze events. Proceedings of the National Academy of Sciences of the United States of America, 117(18), 9755–9761. https://doi.org/10.1073/pnas.1916775117 source
- Not checked yetcites [34] Li, K., Jacob, D. J., Liao, H., Shen, L., Zhang, Q., & Bates, K. H. (2019). Anthropogenic drivers of 2013–2017 trends in summer surface ozone in China. Proceedings of the National Academy of Sciences of the United States of America, 116(2), 422–427. https://doi.org/10.1073/pnas.1812168116 source
- Not checked yetcites [35] Liu, Y., & Wang, T. (2020). Worsening urban ozone pollution in China from 2013 to 2017 – Part 2: The effects of emission changes and implications for multi-pollutant control. Atmospheric Chemistry and Physics, 20(11), 6323–6337. https://doi.org/10.5194/acp-20-6323-2020 source
- Not checked yetcites [36] Hollaway, M., Wild, O., Yang, T., Sun, Y., Xu, W., Xie, C., Whalley, L., Slater, E., Heard, D., & Liu, D. (2019). Photochemical impacts of haze pollution in an urban environment. Atmospheric Chemistry and Physics, 19(15), 9699–9714. https://doi.org/10.5194/acp-19-9699-2019 source
- Not checked yetcites [37] Tian, R., Ma, X., Jia, H., Yu, F., Sha, T., & Zan, Y. (2019). Aerosol radiative effects on tropospheric photochemistry with GEOS-Chem simulations. Atmospheric Environment, 208, 82–94. https://doi.org/10.1016/j.atmosenv.2019.03.032 source
- Not checked yetcites [38] Gao, J., Li, Y., Zhu, B., Hu, B., Wang, L., & Bao, F. (2020). What have we missed when studying the impact of aerosols on surface ozone via changing photolysis rates? Atmospheric Chemistry and Physics, 20, 10831–10844. https://doi.org/10.5194/acp-2020-140 source
- Not checked yetcites [39] Gao, J., Li, Y., Xie, Z., Hu, B., Wang, L., Bao, F., & Fan, S. (2022). The impact of the aerosol reduction on the worsening ozone pollution over the Beijing-Tianjin-Hebei region via influencing photolysis rates. Science of the Total Environment. https://doi.org/10.1016/j.scitotenv.2022.153197 source
- Not checked yetcites [40] Ma, X., Huang, J., Zhao, T., Liu, C., Zhao, K., Xing, J., & Xiao, W. (2020). Rapid increase in summer surface ozone over the North China Plain during 2013–2019: A side effect of particulate matters reduction control? Atmospheric Chemistry and Physics. https://doi.org/10.5194/acp-2020-385 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Decreases (increases) in stratospheric O3 lead to increases (decreases) in tropospheric UV-B radiation and concentrations of OH radicals, and therefore to faster (slower) formation of these PM.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
““secondary” PM is produced in the atmosphere, typically by condensation of gases having low saturation vapor pressures.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“While sulfate and nitrate PM are of secondary origin, for organics the relative global contribution of primary and secondary PM is less clear.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The rate-limiting step in the production of these particles is the reaction of OH with the precursors (NO2, SO2, or VOCs), so that the dependence of OH on UV radiation (see Sect. 2.1) applies directly to the rate of formation of secondary PM as well.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Reduced emissions have systematically improved air quality in many locations, but this has increased UV radiation near the surface, potentially negating some of the benefits of the reduced emissions.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Particulate matter is a major component of air pollution, and particles smaller than about 2.5 µm (PM2.5) are believed to be particularly damaging due to their ability to penetrate deeply into lungs.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and particulate matter
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. The paper may give no reason why it holds.
None of the sources cited for this claim have been checked yet.
In the paper
“Much larger changes would have occurred without the implementation of the Montreal Protocol (the “world avoided”), where unabated growth of emissions of CFCs would have resulted in catastrophic global loss of stratospheric O3 [24], with major impacts on UV radiation [25], incidence of skin cancer [26, 27], and reduction of the global carbon sink by damage to vegetation [28].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > UV radiation and ground-level ozone
What the sources say
- Not checked yetcites [24] Newman, P. A., Oman, L. D., Douglass, A. R., Fleming, E. L., Frith, S. M., Hurwitz, M. M., Kawa, S. R., Jackman, C. H., Krotkov, N. A., Nash, E. R., Nielsen, J. E., Pawson, S., Stolarski, R. S., & Velders, G. J. M. (2009). What would have happened to the ozone layer if chlorofluorocarbons (CFCs) had not been regulated? Atmospheric Chemistry and Physics, 9(6), 2113–2128. https://doi.org/10.5194/acp-9-2113-2009 source
- Not checked yetcites [25] McKenzie, R., Bernhard, G., Liley, B., Disterhoft, P., Rhodes, S., Bais, A., Morgenstern, O., Newman, P., Oman, L., Brogniez, C., & Simic, S. (2019). Success of Montreal Protocol demonstrated by comparing high-quality UV measurements with “World Avoided” calculations from two chemistry-climate models. Scientific Reports, 9, 13. https://doi.org/10.1038/s41598-019-48625-z source
- Not checked yetcites [26] van Dijk, A., Slaper, H., den Outer, P. N., Morgenstern, O., Braesicke, P., Pyle, J. A., Garny, H., Stenke, A., Dameris, M., Kazantzidis, A., Tourpali, K., & Bais, A. F. (2013). Skin cancer risks avoided by the Montreal Protocol–worldwide modeling integrating coupled climate-chemistry models with a risk model for UV. Photochemistry & Photobiology, 89(1), 234–246. https://doi.org/10.1111/j.1751-1097.2012.01223.x source
- Not checked yetcites [27] Madronich, S., Lee-Taylor, J. M., Wagner, M., Kyle, J., Hu, Z., & Landolfi, R. (2021). Estimation of skin and ocular damage avoided in the United States through implementation of the Montreal Protocol on substances that deplete the ozone layer. ACS Earth and Space Chemistry, 5(8), 1876–1888. https://doi.org/10.1021/acsearthspacechem.1c00183 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“In response to this, the World Health Organization (WHO) updated its 2005 Global Air Quality Guidelines (AQG) in September 2021 [83, 84].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [83] WHO. (2021). WHO global air quality guidelines: Particulate matter (PM2.5 and PM10), ozone, nitrogen dioxide, sulfur dioxide and carbon monoxide. Geneva: World Health Organization
- Not checked yetcites [84] WHO. (2017). Evolution of WHO air quality guidelines: Past, present and future (2017). World Health Organization
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Evidence continues to accumulate demonstrating that exposure to air pollution can have serious effects on nearly all organ systems of the human body.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [6] Wilson, S. R., Madronich, S., Longstreth, J. D., & Solomon, K. R. (2019). Interactive effects of changing stratospheric ozone and climate on tropospheric composition and air quality, and the consequences for human and ecosystem health. Photochemical & Photobiological Sciences, 18, 775–803. https://doi.org/10.1039/c8pp90064g source
boosteddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“The new guidelines are aiming for annual mean concentrations of PM2.5 not exceeding 5 µg m−3 and NO2 not exceeding 10 µg m−3, and the peak season mean 8-h O3 concentration not exceeding 60 µg m−3 [83].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [83] WHO. (2021). WHO global air quality guidelines: Particulate matter (PM2.5 and PM10), ozone, nitrogen dioxide, sulfur dioxide and carbon monoxide. Geneva: World Health Organization
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“In the context of the Montreal Protocol, UV-dependent secondary PM (sulfate, nitrate, and secondary organics) is chemically distinct from primary, UV-independent, PM.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper may give no reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Thus, the relative health impacts of secondary vs. primary PM are central to this assessment.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
In the paper
“For comparison, the corresponding 2005 WHO guideline values for PM2.5 and NO2 were 10 µg m−3 and 40 µg m−3 with no recommendation issued for long-term concentrations of O3 [85].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [85] WHO. (2006). Air Quality guidelines: global update 2005: Particulate matter, ozone, nitrogen dioxide and sulfur dioxide (Vol. EUR/05/5046029). World Health Organization. Regional Office for Europe
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“As outlined in our earlier assessment, the health effects of air pollution include cardiovascular and respiratory disease, cancer, effects on the brain and the reproductive system including adverse birth outcomes [6].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [6] Wilson, S. R., Madronich, S., Longstreth, J. D., & Solomon, K. R. (2019). Interactive effects of changing stratospheric ozone and climate on tropospheric composition and air quality, and the consequences for human and ecosystem health. Photochemical & Photobiological Sciences, 18, 775–803. https://doi.org/10.1039/c8pp90064g source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“With the decrease in concentrations of key pollutants, studies now show the detrimental effects on health at relatively low levels of air pollution. Many show effects at concentrations lower than the current annual average standard.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [80] Brauer, M., Brook, J. R., Christidis, T., Chu, Y., Crouse, D. L., Erickson, A., Hystad, P., Li, C., Martin, R. V., Meng, J., Pappin, A. J., Pinault, L. L., Tjepkema, M., van Donkelaar, A., Weichenthal, S., & Burnett, R. T. (2019). Mortality-air pollution associations in low-exposure environments (MAPLE): Phase 1. Research Reports: Health Effects Institute, 203, 1–87
- Not checked yetcites [81] Brunekreef, B., Strak, M., Chen, J., Andersen, Z. J., Atkinson, R., Bauwelinck, M., Bellander, T., Boutron-Ruault, M. C., Brandt, J., Carey, I., Cesaroni, G., Forastiere, F., Fecht, D., Gulliver, J., Hertel, O., Hoffmann, B., de Hoogh, K., Houthuijs, D., Hvidtfeldt, U. A., & Janssen, N. A. H., et al. (2021). Mortality and morbidity effects of long-term exposure to low-level PM2.5, BC, NO2, and O3: An analysis of European cohorts in the ELAPSE project (Vol. WA 754 R432 No. 208, HEI Report Series): Health Effects Institute
- Not checked yetcites [82] Dominici, F., Schwartz, J., Di, Q., Braun, D., Choirat, C., & Zanobetti, A. (Eds.). (2022). Assessing adverse health effects of long-term exposure to low levels of ambient air pollution: Phase 1 (2020/01/08 ed., Vol. 211, HEI Research Reports). Berlin: Health Effects Institute
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“and NO2 exposure HR = 1.031 (95% CI 1.023–1.039).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [115] Shi, L., Steenland, K., Li, H., Liu, P., Zhang, Y., Lyles, R. H., Requia, W. J., Ilango, S. D., Chang, H. H., Wingo, T., Weber, R. J., & Schwartz, J. (2021). A national cohort study (2000–2018) of long-term air pollution exposure and incident dementia in older adults in the United States. Nature Communications, 12(1), 6754. https://doi.org/10.1038/s41467-021-27049-2 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
The quote only partly states this claim.
In the paper
“The authors also observed significant associations between exposure to PM2.5 and the development of Alzheimer’s disease HR = 1.078 (95% CI 1.070–1.086)”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [115] Shi, L., Steenland, K., Li, H., Liu, P., Zhang, Y., Lyles, R. H., Requia, W. J., Ilango, S. D., Chang, H. H., Wingo, T., Weber, R. J., & Schwartz, J. (2021). A national cohort study (2000–2018) of long-term air pollution exposure and incident dementia in older adults in the United States. Nature Communications, 12(1), 6754. https://doi.org/10.1038/s41467-021-27049-2 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
The quote only partly states this claim.
None of the sources cited for this claim have been checked yet.
In the paper
“Ground-level ozone is a particular concern, since numerous studies have demonstrated significant damage [78, 116].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [78] Lefohn, A. S., Malley, C. S., Smith, L., Wells, B., Hazucha, M., Simon, H., Naik, V., Mills, G., Schultz, M. G., Paoletti, E., De Marco, A., Xu, X., Zhang, L., Wang, T., Neufeld, H. S., Musselman, R. C., Tarasick, D., Brauer, M., Feng, Z., Tang, H., et al. (2018). Tropospheric ozone assessment report: Global ozone metrics for climate change, human health, and crop/ecosystem research. Elementa: Science of the Anthropocene, 6, 27. https://doi.org/10.1525/elementa.279 source
- Not checked yetcites [116] Paoletti, E., Feng, Z., De Marco, A., Hoshika, Y., Harmens, H., Agathokleous, E., Domingos, M., Mills, G., Sicard, P., Zhang, L., & Carrari, E. (2020). Challenges, gaps and opportunities in investigating the interactions of ozone pollution and plant ecosystems. Science of the Total Environment, 709, 136188. https://doi.org/10.1016/j.scitotenv.2019.136188 source
boosteddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“The effect of PM10 during higher temperatures increased the risk of mortality by 2.1%, and for hospital admissions the effects increased by 11%.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [108] Areal, A. T., Zhao, Q., Wigmann, C., Schneider, A., & Schikowski, T. (2022). The effect of air pollution when modified by temperature on respiratory health outcomes: A systematic review and meta-analysis. Science of the Total Environment, 811, 152336. https://doi.org/10.1016/j.scitotenv.2021.152336 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The strongest effect found was with respect to PM2.5 and cognitive decline.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [113] Weuve, J., Bennett, E. E., Ranker, L., Gianattasio, K. Z., Pedde, M., Adar, S. D., Yanosky, J. D., & Power, M. C. (2021). Exposure to air pollution in relation to risk of dementia and related outcomes: An updated systematic review of the epidemiological literature. Environmental Health Perspectives, 129(9), 96001. https://doi.org/10.1289/EHP8716 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“A recent review [113] found that, despite a substantial increase in publications, there is only suggestive evidence that air pollution may influence late-life cognitive health as there is still substantial heterogeneity of findings across the studies.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [113] Weuve, J., Bennett, E. E., Ranker, L., Gianattasio, K. Z., Pedde, M., Adar, S. D., Yanosky, J. D., & Power, M. C. (2021). Exposure to air pollution in relation to risk of dementia and related outcomes: An updated systematic review of the epidemiological literature. Environmental Health Perspectives, 129(9), 96001. https://doi.org/10.1289/EHP8716 source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“In a recent meta-analysis, Areal et al. [108] showed that effects of air pollutants were modified by high temperatures, leading to higher mortality from respiratory diseases and an increase in hospital admissions.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [108] Areal, A. T., Zhao, Q., Wigmann, C., Schneider, A., & Schikowski, T. (2022). The effect of air pollution when modified by temperature on respiratory health outcomes: A systematic review and meta-analysis. Science of the Total Environment, 811, 152336. https://doi.org/10.1016/j.scitotenv.2021.152336 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“These studies confirm results from human and other animal studies that air pollutants can enter a pregnant female’s circulatory system and exert many deleterious health effects in multiple body organs including the placenta and the developing fetus [111].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [111] Costello, J. M., Steurer, M. A., Baer, R. J., Witte, J. S., & Jelliffe-Pawlowski, L. L. (2022). Residential particulate matter, proximity to major roads, traffic density and traffic volume as risk factors for preterm birth in California. Paediatric and Perinatal Epidemiology, 36(1), 70–79. https://doi.org/10.1111/ppe.12820 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Photochemical air pollution can damage plants, with potentially adverse effects on agriculture and other natural resources.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [78] Lefohn, A. S., Malley, C. S., Smith, L., Wells, B., Hazucha, M., Simon, H., Naik, V., Mills, G., Schultz, M. G., Paoletti, E., De Marco, A., Xu, X., Zhang, L., Wang, T., Neufeld, H. S., Musselman, R. C., Tarasick, D., Brauer, M., Feng, Z., Tang, H., et al. (2018). Tropospheric ozone assessment report: Global ozone metrics for climate change, human health, and crop/ecosystem research. Elementa: Science of the Anthropocene, 6, 27. https://doi.org/10.1525/elementa.279 source
- Not checked yetcites [116] Paoletti, E., Feng, Z., De Marco, A., Hoshika, Y., Harmens, H., Agathokleous, E., Domingos, M., Mills, G., Sicard, P., Zhang, L., & Carrari, E. (2020). Challenges, gaps and opportunities in investigating the interactions of ozone pollution and plant ecosystems. Science of the Total Environment, 709, 136188. https://doi.org/10.1016/j.scitotenv.2019.136188 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Episodes of air pollution frequently occur in combination with extremes in temperature with synergistic effects on health depending on the pollutant(s) involved, the degree and direction of temperature change, and the characteristics of the geographic area and the populations affected.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
What the sources say
- Not checked yetcites [98] Chersich, M. F., Pham, M. D., Areal, A., Haghighi, M. M., Manyuchi, A., Swift, C. P., Wernecke, B., Robinson, M., Hetem, R., Boeckmann, M., Hajat, S., Nakstad, B., Wright, C. Y., Harvey, C., Wang, C., Durusu, D., Scorgie, F., Rees, H., Harden, L., Roos, N., et al. (2020). Associations between high temperatures in pregnancy and risk of preterm birth, low birth weight, and stillbirths: Systematic review and meta-analysis. British Medical Journal, 371, m3811. https://doi.org/10.1136/bmj.m3811 source
- Not checked yetcites [99] Liu, Z., Meng, Y., Xiang, H., Lu, Y., & Liu, S. (2020). Association of short-term exposure to meteorological factors and risk of hand, foot, and mouth disease: A systematic review and meta-analysis. International Journal of Environmental Research and Public Health. https://doi.org/10.3390/ijerph17218017 source
- Not checked yetcites [100] Moghadamnia, M. T., Ardalan, A., Mesdaghinia, A., Keshtkar, A., Naddafi, K., & Yekaninejad, M. S. (2017). Ambient temperature and cardiovascular mortality: A systematic review and meta-analysis. PeerJ. https://doi.org/10.7717/peerj.3574 source
- Not checked yetcites [101] Gronlund, C. J., Sullivan, K. P., Kefelegn, Y., Cameron, L., & O’Neill, M. S. (2018). Climate change and temperature extremes: A review of heat- and cold-related morbidity and mortality concerns of municipalities. Maturitas, 114, 54–59. https://doi.org/10.1016/j.maturitas.2018.06.002 source
- Not checked yetcites [102] Ryti, N. R., Guo, Y., & Jaakkola, J. J. (2016). Global association of cold spells and adverse health effects: A systematic review and meta-analysis. Environmental Health Perspectives, 124(1), 12–22. https://doi.org/10.1289/ehp.1408104 source
- Not checked yetcites [103] Sharpe, I., & Davison, C. M. (2022). A scoping review of climate change, climate-related disasters, and mental disorders among children in low- and middle-income countries. International Journal of Environmental Research and Public Health. https://doi.org/10.3390/ijerph19052896 source
- Not checked yetcites [104] Syed, S., O’Sullivan, T. L., & Phillips, K. P. (2022). Extreme heat and pregnancy outcomes: A scoping review of the epidemiological evidence. International Journal of Environmental Research and Public Health. https://doi.org/10.3390/ijerph19042412 source
- Not checked yetcites [105] Vu, A., Rutherford, S., & Phung, D. (2019). Heat health prevention measures and adaptation in older populations—A systematic review. International Jorunal of Environmental Research and Public Health. https://doi.org/10.3390/ijerph16224370 source
- Not checked yetcites [106] Zanobetti, A., & O’Neill, M. S. (2018). Longer-term outdoor temperatures and health effects: A review. Current Epidemiology Reports, 5(2), 125–139. https://doi.org/10.1007/s40471-018-0150-3 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Estimated decreases in the annual national production of firewood, timber for poles, roundwood and wood for pulp and paper were 7.5, 7.4, 5.0, and 4.8%, respectively.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [127] Sacchelli, S., Carrari, E., Paoletti, E., Anav, A., Hoshika, Y., Sicard, P., Screpanti, A., Chirici, G., Cocozza, C., & De Marco, A. (2021). Economic impacts of ambient ozone pollution on wood production in Italy. Scientific Reports, 11(1), 1–9. https://doi.org/10.1038/s41598-020-80516-6 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Ozone enters the leaf of the plant through the stomata and forms ROS, which include O2•−, H2O2, OH, 1O2, as well as reactive carbonyl species such as malondialdehyde and methylglyoxal [131].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [131] Oksanen, E., & Kontunen-Soppela, S. (2021). Plants have different strategies to defend against air pollutants. Current Opinion in Environmental Science & Health, 19, 100222. https://doi.org/10.1016/j.coesh.2020.10.010 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Clearly, tropospheric O3 has significant adverse effects on food security in some countries and this might be exacerbated in the event of super-recovery of stratospheric ozone.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
boostedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“In a study in Argentina [119], exposures of soybeans (a sensitive crop) to O3 at a concentration of 274 μg m−3 for 7 days resulted in a reduction in below-ground biomass of 25%, a 30% reduction of nodule biomass, and a 21% reduction of biological nitrogen fixation.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [119] Biancari, L., Cerrotta, C., Menéndez, A. I., Gundel, P. E., & Martínez-Ghersa, M. A. (2021). Episodes of high tropospheric ozone reduce nodulation, seed production and quality in soybean (Glycine max (L.) merr.) on low fertility soils. Environmental Pollution, 269, 116117. https://doi.org/10.1016/j.envpol.2020.116117 source
plaindirectSingle case- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Based on a 4-year average of tropospheric concentration of O3, estimated losses in wheat were 50 million tons per year, mostly in winter wheat (48 million tons); 21 million tons in rice; 18 million tons in maize and 1.6 million tons in soybeans [123].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [123] Wang, Y., Wild, O., Ashworth, K., Chen, X., Wu, Q., Qi, Y., & Wang, Z. (2022). Reductions in crop yields across China from elevated ozone. Environmental Pollution, 292(Pt A), 118218. https://doi.org/10.1016/j.envpol.2021.118218 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“O3 could also interfere with sensory organs and the ability of pollinators to sense sources of nectar or the ability of biological-control organisms to sense their target hosts [134].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [134] Blande, J. D. (2021). Effects of air pollution on plant–insect interactions mediated by olfactory and visual cues. Current Opinion in Environmental Science & Health, 19, 100228. https://doi.org/10.1016/j.coesh.2020.100228 source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“We noted that tropospheric O3 could contribute to significant losses in quality and yield of crops, e.g., 10–36% for wheat and 7–24% for rice.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [6] Wilson, S. R., Madronich, S., Longstreth, J. D., & Solomon, K. R. (2019). Interactive effects of changing stratospheric ozone and climate on tropospheric composition and air quality, and the consequences for human and ecosystem health. Photochemical & Photobiological Sciences, 18, 775–803. https://doi.org/10.1039/c8pp90064g source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Similar effects were echoed in other grape-growing regions across the globe [126].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [126] Blanco-Ward, D., Ribeiro, A., Paoletti, E., & Miranda, A. (2021). Assessment of tropospheric ozone phytotoxic effects on the grapevine (Vitis vinifera L.): A review. Atmospheric Environment, 244, 117924. https://doi.org/10.1016/j.atmosenv.2020.117924 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Results suggested that, at the greatest air-borne exposure, development of the tadpole was delayed and that susceptibility to Bd was increased.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [130] Bosch, J., Elvira, S., Sausor, C., Bielby, J., Gonzalez-Fernandez, I., Alonso, R., & Bermejo-Bermejo, V. (2021). Increased tropospheric ozone levels enhance pathogen infection levels of amphibians. Science of the Total Environment, 759, 143461. https://doi.org/10.1016/j.scitotenv.2020.143461 source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“These reaction products damage components of the cells but also stimulate signaling systems, such as the release of isoprene [132] to activate defense mechanisms.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [132] Li, S., Yuan, X., Feng, Z., Du, Y., Agathokleous, E., & Paoletti, E. (2022). Whole-plant compensatory responses of isoprene emission from hybrid poplar seedlings exposed to elevated ozone. Science of the Total Environment, 806(Pt 4), 150949. https://doi.org/10.1016/j.scitotenv.2021.150949 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Because of this, the total phytotoxic dose of O3 taken up by trees over the season has increased and outweighs the benefits of a decrease in concentration of tropospheric O3 (1.6%) that resulted from measures to control pollution between 2000 and 2014.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [129] Anav, A., De Marco, A., Friedlingstein, P., Savi, F., Sicard, P., Sitch, S., Vitale, M., & Paoletti, E. (2019). Growing season extension affects ozone uptake by European forests. Science of the Total Environment, 669, 1043–1052. https://doi.org/10.1016/j.scitotenv.2019.03.020 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“These impacts could affect both food security and forests.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This could be offset by further reductions in NO and VOC emissions, so the actual O3 concentrations will depend on local and regional air quality control measures, as well as the impacts of climate change and the Montreal Protocol on stratospheric O3.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Other air pollutants co-produced with O3, e.g., peroxyacetyl nitrate (CH3C(O)O2NO2) are also phytotoxic, although their specific effects are difficult to separate from those of O3 [117].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [117] Gaffney, J. S., & Marley, N. A. (2021). The impacts of peroxyacetyl nitrate in the atmosphere of megacities and large urban areas: A historical perspective. ACS Earth and Space Chemistry, 5(8), 1829–1841 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The authors exposed tadpoles of the midwife toad (Alytes obstetricans) to air-borne O3 at concentration up to 180–220 µg m−3 for 8 h per day from an early stage of development (limbs not yet formed) to metamorphosis.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [130] Bosch, J., Elvira, S., Sausor, C., Bielby, J., Gonzalez-Fernandez, I., Alonso, R., & Bermejo-Bermejo, V. (2021). Increased tropospheric ozone levels enhance pathogen infection levels of amphibians. Science of the Total Environment, 759, 143461. https://doi.org/10.1016/j.scitotenv.2020.143461 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
None of the sources cited for this claim have been checked yet.
In the paper
“These defenses include physical actions, such as closure of the stomata, biochemical responses such as the release of superoxide dismutase, catalase, and peroxidases to destroy the ROS, and release of chemical buffers, such as ascorbic acid, glutathione, phenolic chemicals, flavonoids, proline [133], and other amino acids, carotenoids, tocopherols, polyamines, and sugars [131].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [131] Oksanen, E., & Kontunen-Soppela, S. (2021). Plants have different strategies to defend against air pollutants. Current Opinion in Environmental Science & Health, 19, 100222. https://doi.org/10.1016/j.coesh.2020.10.010 source
- Not checked yetcites [133] Boublin, F., Cabassa-Hourton, C., Leymarie, J., & Leitao, L. (2021). Potential involvement of proline and flavonols in plant responses to ozone. Environmental Research, 207, 112214. https://doi.org/10.1016/j.envres.2021.112214 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“VSLSs are important pollutants since they can reach the lower stratosphere, despite their tropospheric lifetime of less than 6 months, and contribute to depletion of stratospheric O3 [148, 149].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [148] Fang, X. K., Pyle, J. A., Chipperfield, M. P., Daniel, J. S., Park, S., & Prinn, R. G. (2019). Challenges for the recovery of the ozone layer. Nature Geoscience, 12(8), 592–596. https://doi.org/10.1038/s41561-019-0422-7 source
- Not checked yetcites [149] Keber, T., Bonisch, H., Hartick, C., Hauck, M., Lefrancois, F., Obersteiner, F., Ringsdorf, A., Schohl, N., Schuck, T., Hossaini, R., Graf, P., Jockel, P., & Engel, A. (2020). Bromine from short-lived source gases in the extratropical northern hemispheric upper troposphere and lower stratosphere (UTLS). Atmospheric Chemistry and Physics, 20(7), 4105–4132. https://doi.org/10.5194/acp-20-4105-2020 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The authors suggested that this was because of the effect of dimming of photosynthetically active radiation by aerosols but that there were some benefits from cooling and nutrients provided via the aerosols.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [124] Zhang, T., Yue, X., Unger, N., Feng, Z., Zheng, B., Li, T., Lei, Y., Zhou, H., Dong, X., & Liu, Y. (2021). Modeling the joint impacts of ozone and aerosols on crop yields in China: An air pollution policy scenario analysis. Atmospheric Environment, 247, 118216. https://doi.org/10.1016/j.atmosenv.2021.118216 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“For example, Rex et al. [151] found a lifetime of dibromomethane (CH2Br2) as long as 188 days inside an OH minimum zone over the West Pacific, while outside the OH minimum zone, the lifetime of CH2Br2 was 55 days.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [151] Rex, M., Wohltmann, I., Ridder, T., Lehmann, R., Rosenlof, K., Wennberg, P., Weisenstein, D., Notholt, J., Kruger, K., Mohr, V., & Tegtmeier, S. (2014). A tropical West Pacific OH minimum and implications for stratospheric composition. Atmospheric Chemistry and Physics, 14(9), 4827–4841. https://doi.org/10.5194/acp-14-4827-2014 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Based on current levels of O3 and aerosols, their results indicated that anthropogenic aerosols reduced yield of rice and wheat by 4.6 and 4.7%, respectively.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [124] Zhang, T., Yue, X., Unger, N., Feng, Z., Zheng, B., Li, T., Lei, Y., Zhou, H., Dong, X., & Liu, Y. (2021). Modeling the joint impacts of ozone and aerosols on crop yields in China: An air pollution policy scenario analysis. Atmospheric Environment, 247, 118216. https://doi.org/10.1016/j.atmosenv.2021.118216 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“In a study of water-extractable chemicals collected from PM2.5 samplers on roadsides in Hungary, 13 common roadside plants were tested for sensitivity using the OECD-227 guideline test [139].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [139] Kováts, N., Hubai, K., Diósi, D., Sainnokhoi, T.-A., Hoffer, A., Tóth, Á., & Teke, G. (2021). Sensitivity of typical European roadside plants to atmospheric particulate matter. Ecological Indicators, 124, 107428. https://doi.org/10.1016/j.ecolind.2021.107428 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“The main precursor of tropospheric O3 is NOx, the tropospheric concentration of which has increased over 1980–2010 (Fig. 6).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [141] Stevenson, D. S., Zhao, A., Naik, V., O’Connor, F. M., Tilmes, S., Zeng, G., Murray, L. T., Collins, W. J., Griffiths, P. T., Shim, S. B., Horowitz, L. W., Sentman, L. T., & Emmons, L. (2020). Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP. Atmospheric Chemistry and Physics, 20(21), 12905–12920. https://doi.org/10.5194/acp-20-12905-2020 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“If emissions of CH4 from anthropogenic and natural sources continue to rise as they have since 2007, this could decrease global mean OH by up to 10% by 2050 [147], increasing the atmospheric lifetime and concentrations of CH4 in a positive feedback.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [147] Turner, A. J., Frankenberg, C., & Kort, E. A. (2019). Interpreting contemporary trends in atmospheric methane. Proceedings of the National Academy of Sciences of the United States of America, 116(8), 2805–2813. https://doi.org/10.1073/pnas.1814297116 source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Economic yield was reduced 34% in wheat exposed to O3 and PM, 44% in wheat exposed to PM only and 52% in plants exposed to O3 alone.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [140] Mina, U., Smiti, K., & Yadav, P. (2021). Thermotolerant wheat cultivar (Triticum aestivum L. var. WR544) response to ozone, EDU, and particulate matter interactive exposure. Environmental Monitoring and Assessment, 193(6), 1–16. https://doi.org/10.1007/s10661-021-09079-x source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Due to the Montreal Protocol and its Amendments, atmospheric mole fractions of CH3Br have declined considerably and, at present, emissions of CH3Br primarily stem from natural sources [152], with some anthropogenic sources related to commercial quarantine and pre-shipment applications.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [152] Nicewonger, M. R., Saltzman, E. S., & Montzka, S. A. (2022). ENSO-driven fires cause large interannual variability in the naturally emitted, ozone-depleting trace gas CH3Br. Geophysical Research Letters, 49, e2021GL09475. https://doi.org/10.1029/2021GL094756 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Cl-VSLSs are mostly of anthropogenic origin, while I-VSLSs and Br-VSLSs, particularly bromoform (CHBr3) and dibromomethane (CH2Br2) are mainly produced in biotic processes and are affected by climate change, including increased coastal runoff and thawing of permafrost [148].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [148] Fang, X. K., Pyle, J. A., Chipperfield, M. P., Daniel, J. S., Park, S., & Prinn, R. G. (2019). Challenges for the recovery of the ozone layer. Nature Geoscience, 12(8), 592–596. https://doi.org/10.1038/s41561-019-0422-7 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“However, the interannual variability in OH from these studies was large, i.e., the difference between modeled and measured OH trends were not statistically significant [141].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [141] Stevenson, D. S., Zhao, A., Naik, V., O’Connor, F. M., Tilmes, S., Zeng, G., Murray, L. T., Collins, W. J., Griffiths, P. T., Shim, S. B., Horowitz, L. W., Sentman, L. T., & Emmons, L. (2020). Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP. Atmospheric Chemistry and Physics, 20(21), 12905–12920. https://doi.org/10.5194/acp-20-12905-2020 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“However, in the period 1980–2010 the modeled global tropospheric concentration of OH has increased, mainly because of increasing concentrations of precursors of tropospheric O3, and UV radiation [141].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [141] Stevenson, D. S., Zhao, A., Naik, V., O’Connor, F. M., Tilmes, S., Zeng, G., Murray, L. T., Collins, W. J., Griffiths, P. T., Shim, S. B., Horowitz, L. W., Sentman, L. T., & Emmons, L. (2020). Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP. Atmospheric Chemistry and Physics, 20(21), 12905–12920. https://doi.org/10.5194/acp-20-12905-2020 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“The effects of PM on plants were previously assessed to be few and minor [5, 6], but new studies suggest they may be important particularly in polluted areas.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [5] Madronich, S., Shao, M., Wilson, S. R., Solomon, K. R., Longstreth, J. D., & Tang, X. Y. (2015). Changes in air quality and tropospheric composition due to depletion of stratospheric ozone and interactions with changing climate: Implications for human and environmental health. Photochemical & Photobiological Sciences, 14, 149–169. https://doi.org/10.1039/c4pp90037e source
- Not checked yetcites [6] Wilson, S. R., Madronich, S., Longstreth, J. D., & Solomon, K. R. (2019). Interactive effects of changing stratospheric ozone and climate on tropospheric composition and air quality, and the consequences for human and ecosystem health. Photochemical & Photobiological Sciences, 18, 775–803. https://doi.org/10.1039/c8pp90064g source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The authors concluded that particulate pollution derived from traffic added substantial additional stress to communities of plants found on roadsides.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [139] Kováts, N., Hubai, K., Diósi, D., Sainnokhoi, T.-A., Hoffer, A., Tóth, Á., & Teke, G. (2021). Sensitivity of typical European roadside plants to atmospheric particulate matter. Ecological Indicators, 124, 107428. https://doi.org/10.1016/j.ecolind.2021.107428 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“The production of CH3Br in seawater is a biological process mediated by phytoplankton such as diatoms [153].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [153] Liu, S. S., Yang, G. P., He, Z., Gao, X. X., & Xu, F. (2021). Oceanic emissions of methyl halides and effect of nutrients concentration on their production: A case of the western Pacific Ocean (2 degrees N to 24 degrees N). Science of the Total Environment, 769, 144488. https://doi.org/10.1016/j.scitotenv.2020.144488 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“The study was conducted during mid-winter and near sources, implying that most of the PM was primary rather than secondary, and hence insensitive to any changes in UV radiation.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
What the sources say
- Not checked yetcites [139] Kováts, N., Hubai, K., Diósi, D., Sainnokhoi, T.-A., Hoffer, A., Tóth, Á., & Teke, G. (2021). Sensitivity of typical European roadside plants to atmospheric particulate matter. Ecological Indicators, 124, 107428. https://doi.org/10.1016/j.ecolind.2021.107428 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The loss from O3 is greater than that from aerosols but they do act additively.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, it is likely that these effects will be localized and could be mitigated by increased controls of tropospheric air pollutants.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“For such studies, methyl chloroform (CH3CCl3) is often used [145] to infer concentrations of OH.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Self-cleaning capacity of the atmosphere
What the sources say
- Not checked yetcites [145] Naus, S., Montzka, S. A., Patra, P. K., & Krol, M. C. (2021). A three-dimensional-model inversion of methyl chloroform to constrain the atmospheric oxidative capacity. Atmospheric Chemistry and Physics, 21(6), 4809–4824. https://doi.org/10.5194/acp-21-4809-2021 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Efforts are now underway to use measurements of the chemical composition of air on commercial aircraft to build up a robust climatology, which can help modeling [166].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [166] Cohen, Y., Marecal, V., Josse, B., & Thouret, V. (2021). Interpol-IAGOS: A new method for assessing long-term chemistry-climate simulations in the UTLS based on IAGOS data, and its application to the MOCAGE CCMI REF-C1SD simulation. Geoscientific Model Development, 14(5), 2659–2689. https://doi.org/10.5194/gmd-14-2659-2021 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
None of the sources cited for this claim have been checked yet.
In the paper
“These folds are not uniformly distributed longitudinally [162, 163] and are common over the Eastern Mediterranean, where they have been identified as a significant cause of elevated concentrations of O3 at ground level that are greater than the European Union air-quality standards [164].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [162] Akritidis, D., Pozzer, A., Flemming, J., Inness, A., & Zanis, P. (2021). A global climatology of tropopause folds in CAMS and MERRA-2 reanalyses. Journal of Geophysical Research: Atmospheres, 126(8), e2020JD034115. https://doi.org/10.1029/2020JD034115 source
- Not checked yetcites [163] Liu, J. H., Rodriguez, J. M., Oman, L. D., Douglass, A. R., Olsen, M. A., & Hu, L. (2020). Stratospheric impact on the Northern Hemisphere winter and spring ozone interannual variability in the troposphere. Atmospheric Chemistry and Physics, 20(11), 6416–6432. https://doi.org/10.5194/acp-20-6417-2020 source
- Not checked yetcites [164] Dafka, S., Akritidis, D., Zanis, P., Pozzer, A., Xoplaki, E., Luterbacher, J., & Zerefos, C. (2021). On the link between the Etesian winds, tropopause folds and tropospheric ozone over the Eastern Mediterranean during summer. Atmospheric Research. https://doi.org/10.1016/j.atmosres.2020.105161 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Air rich in O3 is injected into the troposphere at the edges of the tropics via “folds” (Fig. 8), where thin layers of air from the stratosphere are surrounded (vertically) by air from the troposphere and vice versa.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Similarly, there are ongoing efforts to improve the use of measurements of O3 by satellites in atmospheric modeling [167], and potentially O3 sondes and in situ measurements.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [167] Huijnen, V., Miyazaki, K., Flemming, J., Inness, A., Sekiya, T., & Schultz, M. G. (2020). An intercomparison of tropospheric ozone reanalysis products from CAMS, CAMS interim, TCR-1, and TCR-2. Geoscientific Model Development, 13(3), 1513–1544. https://doi.org/10.5194/gmd-13-1513-2020 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Typically, the magnitude of the STE is inferred as the difference between the calculated production and loss of O3 (termed the residual) rather than modeling STE transport itself [158].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [158] Griffiths, P. T., Murray, L. T., Zeng, G., Shin, Y. M., Abraham, N. L., Archibald, A. T., Deushi, M., Emmons, L. K., Galbally, I. E., Hassler, B., Horowitz, L. W., Keeble, J., Liu, J., Moeini, O., Naik, V., O’Connor, F. M., Oshima, N., Tarasick, D., Tilmes, S., Turnock, S. T., et al. (2021). Tropospheric ozone in CMIP6 simulations. Atmospheric Chemistry and Physics, 21(5), 4187–4218. https://doi.org/10.5194/acp-21-4187-2021 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“In contrast, the results of a modeling and observational study of the regional changes in O3 concentration in the troposphere for the period 1980–1990 through to 2000–2010 [154] suggest an increase in the concentration of O3 at the Earth’s surface, but the other studies (noted above) found that stratospheric O3 led to a small increase over this period in the Northern Hemisphere and no significant”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [154] Williams, R. S., Hegglin, M. I., Kerridge, B. J., Jöckel, P., Latter, B. G., & Plummer, D. A. (2019). Characterising the seasonal and geographical variability in tropospheric ozone, stratospheric influence and recent changes. Atmospheric Chemistry and Physics, 19(6), 3589–3620. https://doi.org/10.5194/acp-19-3589-2019 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Methods for identifying folds within model output are being improved [e.g., [165] and showing some promising consistency among different models [162].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [165] Akritidis, D., Pozzer, A., & Zanis, P. (2019). On the impact of future climate change on tropopause folds and tropospheric ozone. Atmospheric Chemistry and Physics, 19(22), 14387–14401. https://doi.org/10.5194/acp-19-14387-2019 source
- Not checked yetcites [162] Akritidis, D., Pozzer, A., Flemming, J., Inness, A., & Zanis, P. (2021). A global climatology of tropopause folds in CAMS and MERRA-2 reanalyses. Journal of Geophysical Research: Atmospheres, 126(8), e2020JD034115. https://doi.org/10.1029/2020JD034115 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“When assessing the relative importance of changes in GHGs vs ODSs in driving the changes in STE, they did not obtain a consistent picture from the models, although it appears that the two factors are of similar magnitude [161].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [161] Abalos, M., Orbe, C., Kinnison, D. E., Plummer, D., Oman, L. D., Jöckel, P., Morgenstern, O., Garcia, R. R., Zeng, G., Stone, K. A., & Dameris, M. (2020). Future trends in stratosphere-to-troposphere transport in CCMI models. Atmospheric Chemistry and Physics, 20(11), 6883–6901. https://doi.org/10.5194/acp-20-6883-2020 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Calculations using the RCP8.5 scenario showed a marked increase in the concentration of O3 in the troposphere, with a threefold larger amount of O3 transported from the stratosphere than the RCP6.0 scenario [161].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [161] Abalos, M., Orbe, C., Kinnison, D. E., Plummer, D., Oman, L. D., Jöckel, P., Morgenstern, O., Garcia, R. R., Zeng, G., Stone, K. A., & Dameris, M. (2020). Future trends in stratosphere-to-troposphere transport in CCMI models. Atmospheric Chemistry and Physics, 20(11), 6883–6901. https://doi.org/10.5194/acp-20-6883-2020 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“A second confounding factor is that models have used different definitions of the upper boundary (tropopause) of the troposphere.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Quantifying the transport of O3 from the stratosphere is therefore important to understanding tropospheric air quality but remains difficult.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Using observations to constrain models introduces sensitivity to changes in quality and calibration of the input data and this requires careful assessment [167, 168]”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [167] Huijnen, V., Miyazaki, K., Flemming, J., Inness, A., Sekiya, T., & Schultz, M. G. (2020). An intercomparison of tropospheric ozone reanalysis products from CAMS, CAMS interim, TCR-1, and TCR-2. Geoscientific Model Development, 13(3), 1513–1544. https://doi.org/10.5194/gmd-13-1513-2020 source
- Not checked yetcites [168] Krizan, P., Kozubek, M., & Lastovicka, J. (2019). Discontinuities in the ozone concentration time series from MERRA 2 reanalysis. Atmosphere. https://doi.org/10.3390/atmos10120812 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“It is not possible to infer the magnitude of the changes in O3 at ground level from these models, as they report O3 concentrations averaged for the entire vertical extent of the troposphere, and the impact of stratospheric O3 is much larger in the upper troposphere than at the Earth’s surface.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The IPCC AR6 assessment reports a value of 628 ± 800 Tg year−1 for 2010, with the large uncertainty highlighting how poorly this value is known [11].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [11] Szopa, S., Naik, V., Adhikary, B., Artaxo, P., Berntsen, T., Collins, W. D., Fuzzi, S., Gallardo, L., Scharr, A. K., Klimont, Z., Liao, H., Unger, N., & Zanis, P. (2021). Short-lived climate forcers. In V. Masson-Delmotte, P. Zhai, A. Pirani, S. L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M. I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J. B. R. Matthews, T. K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, & B. Zhou (Eds.), Climate Change 2021: The physical science basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Chan
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Other recent estimates include 347 ± 12 Tg year−1 (2007–2010) [156] and 400 ± 60 Tg year−1 (1990–2017) [157].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [156] Wang, M., & Fu, Q. (2021). Stratosphere-troposphere exchange of air masses and ozone concentrations based on reanalyses and observations. Journal of Geophysical Research: Atmospheres, 126(18), e2021JD035159. https://doi.org/10.1029/2021JD035159 source
- Not checked yetcites [157] Ruiz, D. J., & Prather, M. J. (2022). From the middle stratosphere to the surface, using nitrous oxide to constrain the stratosphere–troposphere exchange of ozone. Atmospheric Chemistry and Physics, 22(3), 2079–2093. https://doi.org/10.5194/acp-22-2079-2022 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“These production and loss terms are an order of magnitude larger (around 5000 Tg year−1) than the estimated transport [e.g., 159], so that their difference is highly uncertain.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [159] Hu, L., Jacob, D. J., Liu, X., Zhang, Y., Zhang, L., Kim, P. S., Sulprizio, M. P., & Yantosca, R. M. (2017). Global budget of tropospheric ozone: Evaluating recent model advances with satellite (OMI), aircraft (IAGOS), and ozonesonde observations. Atmospheric Environment, 167, 323–334. https://doi.org/10.1016/j.atmosenv.2017.08.036 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“An assessment of amounts of O3 in the troposphere shows that model estimates of STE were around 1000 Tg year−1 O3 for results reported in 1995 but by 2015 models provided estimates approaching 400 Tg year−1, with a multi-model estimate of 535 ± 160 Tg year−1 for the year 2000 [155].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [155] Archibald, A. T., Neu, J. L., Elshorbany, Y. F., Cooper, O. R., Young, P. J., Akiyoshi, H., Cox, R. A., Coyle, M., Derwent, R. G., Deushi, M., Finco, A., Frost, G. J., Galbally, I. E., Gerosa, G., Granier, C., Griffiths, P. T., Hossaini, R., Hu, L., Jöckel, P., Josse, B., et al. (2020). Tropospheric Ozone Assessment Report: A critical review of changes in the tropospheric ozone burden and budget from 1850 to 2100. Elementa Science of the Anthropocene, 8(1), 10. https://doi.org/10.1525/elementa.2020.034 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Overall, recovery of stratospheric O3, and hence lower intensity of ground-level UV-B radiation, is expected to slightly improve air quality in cities in mid-latitudes but slightly worsen air quality in rural areas.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Conclusions
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Changes in weather patterns, including extreme weather events, are not only caused by climate change but also by polar stratospheric ozone depletion, which strengthens the stratospheric polar vortex.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [23] Bernhard, G. H., Bais, A. F., Aucamp, P. J., Klekociuk, A. R., Liley, J. B., & McKenzie, R. L. (2023). Stratospheric ozone, UV radiation, and climate interactions. Photochemical & Photobiological Sciences. https://doi.org/10.1007/s43630-023-00371-y source
- Not checked yetcites [169] Barnes, P. W., Robson, T. M., Zepp, R. G., Bornman, J. F., Jansen, M. A. K., Ossola, R., Wang, Q.-W., Robinson, S. A., Foereid, B., Klekociuk, A. R., Martinez-Abaigar, J., Hou, W. C., & Paul, N. D. (2023). Interactive effects of changes in UV radiation and climate on terrestrial ecosystems, biogeochemical cycles, and feedbacks to the climate system. Photochemical & Photobiological Sciences. https://doi.org/10.1007/s43630-023-00376-7 source
- Not checked yetcites [170] Robinson, S. A., & Erickson Iii, D. J. (2015). Not just about sunburn – the ozone hole’s profound effect on climate has significant implications for Southern Hemisphere ecosystems. Global Change Biology, 21(2), 515–527. https://doi.org/10.1111/gcb.12739 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Whether such events will occur in the future depends on trends in the emissions of ODSs and GHGs, since GHGs affect the Arctic stratosphere via radiative cooling [180].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [180] von der Gathen, P., Kivi, R., Wohltmann, I., Salawitch, R. J., & Rex, M. (2021). Climate change favours large seasonal loss of Arctic ozone. Nature Communications, 12(1), 1–17. https://doi.org/10.1038/s41467-021-24089-6 source
plainconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, the recovery of stratospheric O3 should decrease the stability of the Antarctic polar vortex, which should lead to wetter conditions in the Southern Hemisphere in the near future for this region.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Hence, UV-B radiation and climate change affect concentrations of tropospheric OH with potential feedbacks on climate change and on stratospheric ozone.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Conclusions
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
- Rests on an assumption: The total known use and release of HFC-134a, HFC-143a, and HFC-227ea between 1990 and 2015 is complete for calculating the theoretical maximum TFA production.
- The authors state this as an assumption: The degradation half-life of TFA in the environment is very long (approximately centuries).
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In future, these data should allow better quantification of the changes in tropospheric O3 that are caused by changes in stratospheric O3.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: fails — It may be too vague to check against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. It may be too vague to check against evidence. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Hence, the frequency of extreme weather events such as droughts and therefore wildfires in both hemispheres is influenced by direct effects of climate change and by changes in atmospheric circulation and in polar stratospheric O3.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“In addition to the strength of the stratospheric polar vortex, the El Niño Southern Oscillation and the Indian Ocean Dipole also affect weather conditions in Australia [172].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [172] Lim, E.-P., Hendon, H. H., Boschat, G., Hudson, D., Thompson, D. W. J., Dowdy, A. J., & Arblaster, J. M. (2019). Australian hot and dry extremes induced by weakenings of the stratospheric polar vortex. Nature Geoscience, 12(11), 896–901. https://doi.org/10.1038/s41561-019-0456-x source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Similarly to the effects of the atmospheric dynamics of the Antarctic ozone hole, Arctic stratospheric ozone depletion results in a shift of the Arctic Oscillation (AO) to more positive values (e.g., [177]) and a more zonal Northern Hemisphere jet stream.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Changes in atmospheric circulation and transport of pollutants
What the sources say
- Not checked yetcites [177] Lawrence, Z. D., Perlwitz, J., Butler, A. H., Manney, G. L., Newman, P. A., Lee, S. H., & Nash, E. R. (2020). The remarkably strong arctic stratospheric polar vortex of winter 2020: Links to record-breaking Arctic oscillation and ozone loss. Journal of Geophysical Research: Atmospheres. https://doi.org/10.1029/2020jd033271 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“These properties indicate that TFA and its salts will not bioaccumulate in organisms other than terrestrial plants and will not biomagnify in food chains.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Background
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The physical and chemical properties of TFA are well known [201] but key to assessing environmental risk is that it is a strong acid with a pKa of 0.3 and is completely miscible with water [190].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Background
What the sources say
- Not checked yetcites [190] PubChem. (2022). Trifluoroacetic acid. https://pubchem.ncbi.nlm.nih.gov/compound/6422. Accessed 1 Jan 2022
boosted- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Much of the impact of air pollutants is due to chemicals produced by UV-B-initiated photochemistry, including O3 and PM, i.e., secondary inorganic and organic aerosols.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper may give no reason why it holds.
In the paper
“However, the theory that TFA can be formed from geogenic sources has been challenged [229].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [229] Joudan, S., DeSilva, A. O., & Young, C. (2021). Insufficient evidence for the existence of natural trifluoroacetic acid. Environmental Science: Processes & Impacts, 23, 1641–1649. https://doi.org/10.1039/d1em00306b source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
None of the sources cited for this claim have been checked yet.
In the paper
“This is consistent with the report that concentrations of TFA increase with proximity to locations of undersea volcanic vents [227, 228].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [227] Scott, B., Macdonald, R., Kannan, K., Fisk, A., Witter, A., Yamashita, N., Durham, L., Spencer, C., & Muir, D. (2005). Trifluoroacetate profiles in the Arctic, Atlantic, and Pacific oceans. Environmental Science & Technology, 39, 6555–6560. https://doi.org/10.1021/es047975u source
- Not checked yetcites [228] Scott, B. F., Spencer, C., Martin, J. W., Barra, R., Bootsma, H. A., Jones, K. C., Johnston, A. E., & Muir, D. C. G. (2005). Comparison of haloacetic acids in the environment of the Northern and Southern Hemispheres. Environmental Science & Technology, 39(22), 8664–8670. https://doi.org/10.1021/es050118l source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
None of the sources cited for this claim have been checked yet.
In the paper
“Since the early reports of the widespread presence of TFA in marine waters [213, 226] and its association with 14C-dated deep waters older than 1000 years [227], it was believed that there are natural sources of TFA.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [213] Frank, H., Christoph, E. H., Holm-Hansen, O., & Bullister, J. L. (2002). Trifluoroacetate in ocean waters. Environmental Science & Technology, 36, 12–15. https://doi.org/10.1021/es0101532 source
- Not checked yetcites [226] Frank, H., Klein, A., & Renschen, D. (1996). Environmental trifluoroacetate. Nature, 382, 34–34. https://doi.org/10.1038/382034a0 source
- Not checked yetcites [227] Scott, B., Macdonald, R., Kannan, K., Fisk, A., Witter, A., Yamashita, N., Durham, L., Spencer, C., & Muir, D. (2005). Trifluoroacetate profiles in the Arctic, Atlantic, and Pacific oceans. Environmental Science & Technology, 39, 6555–6560. https://doi.org/10.1021/es047975u source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“As discussed in the previous update report [225], maize and poplar plants take up TFA from contaminated soils [236].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [236] Lan, Z., Yao, Y., Xu, J., Chen, H., Ren, C., Fang, X., Zhang, K., Jin, L., Hua, X., & Alder, A. C. (2020). Novel and legacy per-and polyfluoroalkyl substances (PFASs) in a farmland environment: Soil distribution and biomonitoring with plant leaves and locusts. Environmental Pollution, 263, 114487. https://doi.org/10.1016/j.envpol.2020.114487 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“That this amount of TFA (measured in the 1990s) is all from anthropogenic sources is very unlikely, and geogenic sources are more plausible.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
hedgedSingle case- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The authors suggest that the sources of TFA are replacements for the CFCs, mostly from precipitation. The authors are likely correct in this conclusion.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Trifluoroacetic acid in precipitation
What the sources say
- Not checked yetcites [222] Freeling, F., Scheurer, M., Koschorreck, J., Hoffmann, G., Ternes, T. A., & Nödler, K. (2022). Levels and temporal trends of trifluoroacetate (TFA) in archived plants: Evidence for increasing emissions of gaseous TFA precursors over the last decades. Environmental Science & Technology Letters, 5, 400–405. https://doi.org/10.1021/acs.estlett.2c00164 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“If, as seems to be the case, the half-life is likely very long (≈ centuries), very small amounts could accumulate over time to explain the amounts observed in oceans and endorheic basins.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
- The authors state this as an assumption: The degradation half-life of TFA in the environment is very long (approximately centuries).
In the paper
“The source of the TFA was most likely degradation of fluorinated gases in the troposphere and the authors suggest that the seasonality is because of seasonal changes in solar UV radiation and the photochemical formation of OH radicals responsible for production of TFA in the troposphere [220].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Trifluoroacetic acid in precipitation
What the sources say
- Not checked yetcites [220] Freeling, F., Behringer, D., Heydel, F., Scheurer, M., Ternes, T. A., & Nödler, K. (2020). Trifluoroacetate in precipitation: Deriving a benchmark dataset. Environmental Science & Technology, 54, 11210–11219. https://doi.org/10.1021/acs.est.0c02910 source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Concentrations of PFOS and PFOA were greater than TFA and these chemicals are more toxic than TFA and are retained in the body for longer periods (Table 2).”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [242] Duan, Y., Sun, H., Yao, Y., Meng, Y., & Li, Y. (2020). Distribution of novel and legacy per-/polyfluoroalkyl substances in serum and its associations with two glycemic biomarkers among Chinese adult men and women with normal blood glucose levels. Environment International, 134, 105295. https://doi.org/10.1016/j.envint.2019.105295 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The frequency of detection of TFA was 97% but 12 other PFAS had greater frequencies of detection.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [242] Duan, Y., Sun, H., Yao, Y., Meng, Y., & Li, Y. (2020). Distribution of novel and legacy per-/polyfluoroalkyl substances in serum and its associations with two glycemic biomarkers among Chinese adult men and women with normal blood glucose levels. Environment International, 134, 105295. https://doi.org/10.1016/j.envint.2019.105295 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Some bacteria use fluoxetine (Prozac®, CAS# 54,910-89-3) as a sole source of carbon and the terminal metabolite is TFA [249], which is not further metabolized.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [249] Khan, M. F., & Murphy, C. D. (2021). Bacterial degradation of the anti-depressant drug fluoxetine produces trifluoroacetic acid and fluoride ion. Applied Microbiology and Biotechnology, 105, 9359–9369. https://doi.org/10.1007/s00253-021-11675-3 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The original source(s) of the contamination in the dusts are unknown but there were amounts of unknown precursors (37 − 67 mol %) for PFAS in the dust [245].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [245] Wang, B., Yao, Y., Wang, Y., Chen, H., & Sun, H. (2021). Per-and polyfluoroalkyl substances in outdoor and indoor dust from Mainland China: Contributions of unknown precursors and implications for human exposure. Environmental Science & Technology, 56(10), 6036–6045. https://doi.org/10.1021/acs.est.0c08242 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Median concentrations of TFA in outdoor dust from six locations in China ranged from 61,000 to 222,000 µg a.e. kg−1 with no consistent differences between rural and urban sites.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [245] Wang, B., Yao, Y., Wang, Y., Chen, H., & Sun, H. (2021). Per-and polyfluoroalkyl substances in outdoor and indoor dust from Mainland China: Contributions of unknown precursors and implications for human exposure. Environmental Science & Technology, 56(10), 6036–6045. https://doi.org/10.1021/acs.est.0c08242 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The authors reported an association between the sum of the concentrations of PFAS and biomarkers of diabetes but offered no insight as to causality by a specific chemical or the route of exposure to these chemicals.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [242] Duan, Y., Sun, H., Yao, Y., Meng, Y., & Li, Y. (2020). Distribution of novel and legacy per-/polyfluoroalkyl substances in serum and its associations with two glycemic biomarkers among Chinese adult men and women with normal blood glucose levels. Environment International, 134, 105295. https://doi.org/10.1016/j.envint.2019.105295 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“These values are 4.4 orders of magnitude less than the NOED (No Observed Effect Dose) for TFA in rats (discussed below) and do not suggest biologically significant risks for humans.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“As of 2020, the number of pharmaceuticals containing fluorine atom(s) was 369 [247] and in 2021, 13 new products containing fluorine were added [248]. Of these, 77 contain C–CF3 moieties [from Fig. 4 in [247]].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [247] Inoue, M., Sumii, Y., & Shibata, N. (2020). Contribution of organofluorine compounds to pharmaceuticals. ACS Omega, 5(19), 10633–10640. https://doi.org/10.1021/acsomega.0c00830 source
- Not checked yetcites [248] Yu, Y., Liu, A., Dhawan, G., Mei, H., Zhang, W., Izawa, K., Soloshonok, V. A., & Han, J. (2021). Fluorine-containing pharmaceuticals approved by the FDA in 2020: Synthesis and biological activity. Chinese Chemical Letters. https://doi.org/10.1016/j.cclet.2021.05.042 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“TFA can also be formed from some fluoro-pharmaceuticals during treatment of water with O3. The molar yield of TFA from fluoxetine solutions treated with O3 at 4 mg L−1 was as large as 40% [202].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [202] Scheurer, M., Nödler, K., Freeling, F., Janda, J., Happel, O., Riegel, M., Müller, U., Storck, F. R., Fleig, M., Lange, F. T., Brunsch, A., & Brauch, H.-J. (2017). Small, mobile, persistent: Trifluoroacetate in the water cycle—Overlooked sources, pathways, and consequences for drinking water supply. Water Research, 126, 460–471. https://doi.org/10.1016/j.watres.2017.09.045 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The median concentration of TFA in serum of the volunteers was 8460 ng L−1 and the 75th centile was 12,550 ng a.e. L−1.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [242] Duan, Y., Sun, H., Yao, Y., Meng, Y., & Li, Y. (2020). Distribution of novel and legacy per-/polyfluoroalkyl substances in serum and its associations with two glycemic biomarkers among Chinese adult men and women with normal blood glucose levels. Environment International, 134, 105295. https://doi.org/10.1016/j.envint.2019.105295 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The potential annual production of TFA from use of pesticides in Germany was 504 tons per year (Fig. 14), based on a mean of 3 years) but should not be compared directly with the data from the United States (Table 4), which presents total estimated use over 26 years.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [214] UBA. (2021). Persistent degradation products of halogenated refrigerants and blowing agents in the environment: Type, environmental concentrations, and fate with particular regard to new halogenated substitutes with low global warming potential (Vol. FB000452/ENG). Umwelt Bundesamt
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Salts of TFA have low toxicity to animals and plants and there are very wide margins between current/projected exposures and toxicity values.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, there is some uncertainty in the environmental toxicity values because only two marine species are included in the toxicity data set for aquatic species; and marine macrophytes, which are keystone species with respect to habitat, have not been tested.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The Montreal Protocol has led to the replacement of ODSs with fluorinated chemicals”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper may give no reason why it holds.
In the paper
“Studies on the photolysis of the lampricide 3-trifluoromethyl-4-nitrophenol (TFM CAS# 88–30-2) used to control the sea lamprey in the North American Great Lakes have shown that photolysis (365 nm) results in the formation of TFA [255]. Yields were dependent on the pH of the solution and ranged from 5 to 18%.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [255] Ellis, D. A., & Mabury, S. A. (2000). The aqueous photolysis of TFM and related trifluoromethylphenols. An alternate source of trifluoroacetic acid in the environment. Environmental Science & Technology, 34, 632–637. https://doi.org/10.1021/es990422c source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“UV-B radiation is essential to the formation of photochemical smog, including ground-level O3, particulate matter”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper may give no reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This persistence is not a major concern because it does not react with biomolecules.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Still, MIR studies and atmospheric modeling studies of HFO-1234yf, have shown that O3 production from HFO-1234yf is indistinguishable from that from ethane (also consistent with Online Resource Table 3), and that replacing HFC-134a in vehicle air conditioning units with HFO-1234yf across the United States has a negligible impact (< 0.01%) on the formation of tropospheric ozone.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other issues relevant to the degradation of fluorinated chemicals and release of TFA
What the sources say
- Not checked yetcites [267] Carter, W. P. L. (1994). Development of ozone reactivity scales for volatile organic compounds. Air & Waste, 44, 881–899. https://doi.org/10.1080/1073161X.1994.10467290 source
- Not checked yetcites [269] Carter, W. P. L. (2009). Investigation of Atmospheric Ozone Impacts of Trans 2,3,3,3-Tetrafluoropropene, Final Report for Contract UCR-09010016. Center for Environmental Research and Technology, College of Engineering, University of California, Riverside, California
boosted- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Because of its lack of reactivity, TFA salts are persistent in the environment and estimates of half-life are uncertain but could be in the range of centuries or millennia.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The HFOs and HCFOs have shorter lifetimes in the atmosphere and deposition of TFA from these substances is likely to be more localized. This will result in greater concentrations near the locations of release.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Future changes in UV-B radiation are uncertain”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“however, interactions with climate change complicate predictions”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper may give no reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This is unlikely to present a risk to humans or the environment in these locations but changes in concentration in surface water (or soil) would respond rapidly to releases.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“TFA and its salts are easily excreted by animals and do not bioaccumulate in food chains.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Current and projected (to 2100) concentrations of TFA in the oceans provide a very large margin of exposure (thousand-fold) when compared to thresholds of toxicity, and risks to the environment and human health are de minimis.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Some pesticides also contain one or more C–CF3 moieties [254] and are potential sources of TFA in the environment [225].”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
What the sources say
- Not checked yetcites [254] Ogawa, Y., Tokunaga, E., Kobayashi, O., Hirai, K., & Shibata, N. (2020). Current contributions of organofluorine compounds to the agrochemical industry. Iscience, 23, 101467. https://doi.org/10.1016/j.isci.2020.101467 source
- Not checked yetcites [225] Neale, R. E., Barnes, P. W., Robson, T. M., Neale, P. J., Williamson, C. E., Zepp, R. G., Wilson, S. R., Madronich, S., Andrady, A. L., Heikkilä, A. M., Bernhard, G. H., Bais, A. F., Aucamp, P. J., Banaszak, A. T., Bornman, J. F., Bruckman, L. S., Byrne, S. N., Foereid, B., Häder, D. P., … Zhu, M. (2021). Environmental effects of stratospheric ozone depletion, UV radiation, and interactions with climate change: UNEP Environmental Effects Assessment Panel, Update 2020. Photochemical & Photobiological Sciences, 20, 1–67. https://doi.org/10.1007/s43630-020-00001-x source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“TFA is known to have a long environmental lifetime”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
boosted- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper may give no reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“TFA does not bioaccumulate nor is it toxic at the low to moderate exposures currently measured in the environment or those predicted in the distant future.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Human and environmental risks associated with trifluoroacetic acid in the environment
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Although this new study on R. subcapitata has not been published in the literature, the study was conducted under Good Laboratory Practice Guidelines with Quality Assurance and Quality Control [262]. The detailed report of the study was reviewed by ECHA [263] and was classified as “reliable without restriction”, hence it has been used here in the characterization of the toxicity of TFA to aquatic”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Human and environmental risks associated with trifluoroacetic acid in the environment
What the sources say
- Not checked yetcites [262] OECD. (2022). Good Laboratory Practice (GLP). https://www.oecd.org/chemicalsafety/testing/good-laboratory-practiceglp.htm. Accessed 1 Apr 2022
- Not checked yetcites [263] ECHA. (2021). Trifluoroacetic acid: Toxicity to aquatic algae and cyanobacteria. https://echa.europa.eu/registration-dossier/-/registered-dossier/5203/6/2/6/?documentUUID=9e9959f8-a994-4b8c-93d7-de7a1a3c1cfa. Accessed 1 Dec 2021
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Because the HCFCs and HFCs are long-lived in the atmosphere, they distribute globally and TFA from these substances is more evenly deposited.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“These releases will add to the existing load of TFA in the environment but predicted amounts are well below the threshold for concern with respect to human and environmental health.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
boosteddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Even in the subclass of perfluorinated alkanoic acids, the physical, chemical, and biological properties of these substances differ widely, mostly in relation to length of the alkyl chain.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper may give no reason why it holds.
In the paper
“Stabilized Criegee intermediates (SCI), highly reactive chemicals formed in the atmosphere, react rapidly with PFCAs including TFA, producing hydroperoxyfluoroesters. This is likely the dominant gas-phase fate of PFCAs [281], although this only constitutes a temporary reservoir.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other issues relevant to the degradation of fluorinated chemicals and release of TFA
What the sources say
- Not checked yetcites [281] Taatjes, C. A., Khan, M. A. H., Eskola, A. J., Percival, C. J., Osborn, D. L., Wallington, T. J., & Shallcross, D. E. (2019). Reaction of perfluorooctanoic acid with Criegee intermediates and implications for the atmospheric fate of perfluorocarboxylic acids. Environmental Science & Technology, 53(3), 1245–1251. https://doi.org/10.1021/acs.est.8b05073 source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“In 2020 the measured mean abundances of HFO-1234ze and HCFO-1233zd(E) in central Europe at Jungfraujoch (remote, 3580 m above sea level) were 0.98 ng/m3 (0.21 pptv) and 1.01 ng/m3 (0.19 pptv), respectively. This is an increase from 0.18 ng/m3 (0.039 pptv) and 0.02 ng m−3 (0.003 pptv) in 2013 at this same measurement station.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other issues relevant to the degradation of fluorinated chemicals and release of TFA
What the sources say
- Not checked yetcites [270] Lefrancois, F., Jesswein, M., Thoma, M., Engel, A., Stanley, K., & Schuck, T. (2021). An indirect-calibration method for non-target quantification of trace gases applied to a time series of fourth-generation synthetic halocarbons at the Taunus Observatory (Germany). Atmospheric Measurement Techniques, 14(6), 4669–4687. https://doi.org/10.5194/amt-14-4669-2021 source
- Not checked yetcites [271] Vollmer, M. K., Reimann, S., Hill, M., & Brunner, D. (2015). First observations of the fourth generation synthetic halocarbons HFC-1234yf, HFC-1234ze(E), and HCFC-1233zd(E) in the atmosphere. Environmental Science & Technology, 49(5), 2703–2708. https://doi.org/10.1021/es505123x source
- Not checked yetcites [272] Vollmer, M. K., Reimann, S., Hill, M., & Brunner, D. (2020). Update to Vollmer, M. K., S. Reimann, M. Hill, D. Brunner, First observations of the fourth generation synthetic halocarbons HFC-1234yf, HFC-1234ze(E), and HCFC-1233zd(E) in the atmosphere. Environ Sci Technol, 49, 2703–2708, https://doi.org/10.1021/es505123x. https://www.empa.ch/documents/56101/190047/HFO+update+Report/fe3b26b5-fcb6-4cd9-a6f6-5c39ac01f20a. Accessed 2 July 2022 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“It is formed from combustion of fluoropolymers and as a terminal breakdown product of fluorinated pharmaceuticals and pesticides.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“In effect, the SCI-mediated oxidation products were found to have no significant impact on concentrations or distributions of TFA in the atmosphere [216] and this is not a pathway for net destruction of TFA in the environment.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other issues relevant to the degradation of fluorinated chemicals and release of TFA
What the sources say
- Not checked yetcites [216] Holland, R., Khan, M. A. H., Driscoll, I., Chhantyal-Pun, R., Derwent, R. G., Taatjes, C. A., Orr-Ewing, A. J., Percival, C. J., & Shallcross, D. E. (2021). Investigation of the production of trifluoroacetic acid from two halocarbons, HFC-134a and HFO-1234yf and its fates using a global three-dimensional chemical transport model. ACS Earth and Space Chemistry, 5, 849–857. https://doi.org/10.1021/acsearthspacechem.0c00355 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The Montreal Protocol has prevented large increases in UV-B radiation”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Overall conclusions
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper may give no reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Amounts released from degradation of pharmaceuticals are very uncertain and amounts from fugitive releases from manufacturing are completely unknown.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Conclusions and uncertainties
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The margin of exposure between the distribution of NOECs and the observed and expected concentrations in the oceans and endorheic basins is several orders of magnitude and is indicative of de minimis risk.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Human and environmental risks associated with trifluoroacetic acid in the environment
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Those pharmaceuticals that contain the C–CF3 moiety are expected to be a source of TFA in the environment but there are two unknowns, the yield of TFA from the breakdown of the pharmaceutical and the amounts of pharmaceuticals that are used.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other sources of trifluoroacetic acid in the global environment
plainconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“TFA enhances the formation rate of new dimethylamine/sulfuric particles significantly (up to 227-fold [278]), but only under conditions of relatively low temperatures and sulfuric acid concentrations, and relatively high TFA and dimethylamine concentration.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > Trifluoroacetic acid in the global environment with relevance to the Montreal Protocol > Other issues relevant to the degradation of fluorinated chemicals and release of TFA
What the sources say
- Not checked yetcites [278] Liu, L., Yu, F., Tu, K., Yang, Z., & Zhang, X. (2021). Influence of atmospheric conditions on the role of trifluoroacetic acid in atmospheric sulfuric acid–dimethylamine nucleation. Atmospheric Chemistry and Physics, 21(8), 6221–6230. https://doi.org/10.5194/acp-21-6221-2021 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
The paper relies on this without support.
Secondary aerosols are generated by UV-driven photochemistry.
“This is of direct relevance to the Montreal Protocol, since secondary aerosols are generated by UV-driven photochemistry.”
The paper relies on this without support.
The hydroxyl radical is the major oxidant in the troposphere and its concentration largely determines the lifetime of many tropospheric pollutants.
“The hydroxyl radical (OH) is the major oxidant in the troposphere and its concentration largely determines the lifetime of many tropospheric pollutants.”
The paper relies on this without support.
OH is produced via UV-B photolysis of O3.
“It is produced via UV-B photolysis of O3 (see Fig. 1).”
The authors state this as an assumption.
TFA is evenly distributed across all oceans when estimating 2100 ocean concentrations.
“if evenly distributed across all oceans”
The authors state this as an assumption.
The proportions of TFA from other refrigerants in Germany can be applied to the global estimate of deposition.
“If the proportions of TFA from other refrigerants in Germany are applied to the global estimate of deposition”
The authors state this as an assumption.
The ten-fold range used to estimate total oceanic TFA from measured concentrations is appropriate.
“using an estimated ten-fold range”
The paper relies on this without support.
The total known use and release of HFC-134a, HFC-143a, and HFC-227ea between 1990 and 2015 is complete for calculating the theoretical maximum TFA production.
“From the total known use and release of HFC-134a, HFC-143a, and HFC-227ea between 1990 and 2015, the total amount of TFA that could theoretically have been produced is 4.5 × 106 tons.”
The authors state this as an assumption.
The degradation half-life of TFA in the environment is very long (approximately centuries).
“If, as seems to be the case, the half-life is likely very long (≈ centuries)”
The paper relies on this without support.
Increases in the activity of enzymes in or originating from the liver are considered as compensatory unless accompanied by physiological responses such as loss of weight.
“Increases in the activity of enzymes in or originating from the liver are considered as compensatory unless accompanied by physiological responses such as loss of weight.”
The paper relies on this without support.
HFOs have very short atmospheric lifespans and do not contribute to climate change.
“Because of this, there is a trend to replace long-lived HCFCs and HFCs with HFOs, which have very short atmospheric lifespans and do not contribute to climate change.”
The paper relies on this without support.
Fugitive releases have resulted in high levels of contamination near manufacturing facilities and TFA is routinely detected in surface waters.
“Fugitive releases have resulted in high levels of contamination near manufacturing facilities and TFA is routinely detected in surface waters.”
The authors state this as an assumption.
The actual yield of TFA from pesticides is dependent on other substituents on the molecule and the primary driver(s) of degradation, so the calculated yields based on molecular weight ratios are conservative.
“This is a conservative assumption as the actual yield of TFA is dependent on other substituents on the molecule and the primary driver(s) of degradation.”
The paper relies on this without support.
Poor air quality remains a major health problem globally, despite progress in reducing anthropogenic emissions of air pollutants.
“Poor air quality remains a major health problem globally, despite progress in reducing anthropogenic emissions of air pollutants.”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
The source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
In the citing paper
“The inclusion of CF3H generated by ozonolysis does not alter our previous assessments [84, 85] that HFOs have minimal contributions to the radiative forcing of climate change.”
From Environmental consequences of interacting effects of changes in stratospheric ozone, ultraviolet radiation, and climate: UNEP Environmental Effects Assessment Panel, Update 2024 (2025) · cites this paper as [85]
Experimental — accuracy not yet measuredThe cited source says what the claim attributes to it.
In the citing paper
“The current concentrations of TFA in drinking water and surface waters remain below current thresholds of concern for human and ecological health [85, 94].”
The cited source says what the claim attributes to it.
In the citing paper
“Therefore, there is no change to the previous assessment of de minimis risk from TFA to the environment and human health [84, 85].”
The cited source says what the claim attributes to it.
In the citing paper
“As discussed in our previous assessments [84, 85], photolysis is an important mechanism through which CF3CHO is lost from the atmosphere.”
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Rated minor: it would not touch a result — a value no result rests on, a p-value that stays on the same side of the significance level, or a conflict that is clerical, resolved elsewhere in the paper, or outside its own findings.
In the paper
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
“OR: 1.019”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Health impacts of photochemical smog
“95% CI 1.1013–1.024”
Rated minor: it would not touch a result — a value no result rests on, a p-value that stays on the same side of the significance level, or a conflict that is clerical, resolved elsewhere in the paper, or outside its own findings.
In the paper
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
“The loss from O3 is greater than that from aerosols but they do act additively.”
§ Changes in tropospheric air quality related to the protection of stratospheric ozone in a changing climate > UV-dependent air pollutants and their effects on human health, plants, and the self-cleaning capacity of the troposphere > Effects of tropospheric ozone and particulates on plants
“Economic yield was reduced 34% in wheat exposed to O3 and PM, 44% in wheat exposed to PM only and 52% in plants exposed to O3 alone.”
Citations
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Metadata
- Authors
- Madronich, S., Sulzberger, B., Longstreth, J. D., Schikowski, T., Andersen, M. P. S., Solomon, K. R., & Wilson, S. R.
- Affiliations
- NSF National Center for Atmospheric Research (US)
- Swiss Federal Institute of Aquatic Science and Technology (CH)
- Leibniz Institute of Environmental Medicine (DE)
- California State University, Northridge (US)
- University of Guelph (CA)
- University of Wollongong (AU)
- Corresponding author
- Madronich, S.
- Wilson, S. R.
- ORCID
- Venue
- Photochemical & Photobiological Sciences
- Published
- 2023-06-13
- Volume
- 22
- Issue
- 5
- Pages
- 1129-1176
- ISSN
- 1474-905X (ISSN-L)
- 1474-9092
- PMC
- PMC10262938
- OpenAlex
- W4380422192
- Semantic Scholar
- 665b7bfcabc45131fd17451ac3d52a81ca0be6f8
- Cited by
- 64
- References
- 257
- Citations by year
- 2026: 14 · 2025: 21 · 2024: 22 · 2023: 7
- FWCI
- 7.05
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Photochemical & Photobiological Sciences (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DORA Eawag (Swiss Federal Institute of Aquatic Science and Technology (Eawag)) (submittedVersion, cc-by)
- Research Online (University of Wollongong) (submittedVersion)
- Figshare (submittedVersion)
- Funders
- U.S. Department of Agriculture
- Colorado State University
- National Institute of Food and Agriculture (2019‐34263‐30552:, 2022‐34263‐38472)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Atmospheric Ozone and Climate
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Atmospheric chemistry and aerosols
- Physical Sciences › Environmental Science › Global and Planetary Change › Atmospheric aerosols and clouds
- Keywords
- tropospheric ozone, particulate matter, stratospheric ozone recovery, Montreal Protocol, ultraviolet radiation, hydroxyl radicals, methane, ozone-depleting substances, hydrofluorocarbons, hydrofluoroolefins, trifluoroacetic acid, climate change, air quality, secondary organic aerosol, ozone transport
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
A language model drew the claims from the paper on 2026-10-07, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).
A second model labelled each claim on 2026-10-07 (model jev-1.13-20260917, definition revision gold-guideline-v0.2).
Cited sources are checked with a language model’s help (gpt-6-sol).
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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