A Systematic Review and Meta-analysis of Short-term Relationship between Ambient Air Pollution and Psoriasis
Open accessAbstract
Exposure to air pollution is emerging as a risk factor for psoriasis, but with conflicting findings. The objectives of this meta-analysis were to investigate and summarize the study on the association between short-term exposure to air pollution and psoriasis. We searched the Embase, PudMed, Web of Science and Cochrane Library for indexed publications up to March 17, 2023. We extracted quantitative measures for air pollution effects on psoriasis with acute effect (single lag: lag 0 or lag 1) and short-term cumulative lag effects (cumulative lags: lag 0–5 or lag 0–7 days). The random-effect model was the primary approach used to calculate the excess risk percentage (ER%) and confidence intervals (CI) for particulate matter (PM) with diameter ≤ 10 µm (PM10) and ≤ 2.5 µm (PM2.5), nitrogen dioxide (NO2), sulfur dioxide (SO2) and ozone (O3). For acute effect, ER% for each 10 µg m–3 increase of pollutants was 2.0% (95% CI: 0.4%, 3.7%) for NO2. For the short-term cumulative lag effects, ER% for each 10 µg m–3 increase of pollutants was 3.0% (95% CI: 0.2%, 5.9%) for NO2, 1.2% (95% CI: 0.3%, 0.21%) for PM10 and 0.2% (95% CI: 0.2%, 0.3%) for PM2.5. The results of subgroup analysis suggested that female may be more sensitive to PM2.5 and compared with the warm season, the effects of NO2 and PM2.5 on psoriasis were more significant in the cold season. Systematic reviews have shown that short-term exposure to ambient air pollutants (NO2, PM2.5, PM10) are associated with an increased risk of psoriasis.
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Existing systematic reviews fail to evaluate evidence based on critical aspects of study design, such as bias in selection of participants, exposure and outcome assessments, and consideration of potential confounding effects.
“Further, they fail to evaluate evidence based on critical aspects of study design, for example, bias in the selection of participants, exposure and outcome assessments, and consideration of potential confounding effects.”
From Air Pollution and Skin Diseases: A Systematic Review of Epidemiological Evidence (2026) · cites this paper as [22]
Section 2.4 (Risk of Bias Assessment; page not provided) says this systematic review evaluated included studies for selection bias, exposure assessment, outcome measurement, and confounding—the very aspects the claim says reviews fail to assess. Section 3.2 reports the resulting ratings. Our copy therefore makes the contrary point about this review. (LLM, conf=0.90)
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Experimental — accuracy not yet measuredExisting systematic reviews on air pollution and skin diseases have typically focused on a limited subset of skin diseases and/or air pollutants, often targeting a narrow audience within environmental epidemiology.
“Existing systematic reviews on AP and skin diseases have typically focused on a limited subset of skin diseases, and/or air pollutants, often targeting a narrow audience within the field of environmental epidemiology [12, 22].”
From Air Pollution and Skin Diseases: A Systematic Review of Epidemiological Evidence (2026) · cites this paper as [22]
The Methods (section 2.1) identify this as a systematic review limited to air pollution and psoriasis, so it supports the claim that an existing review focuses on a subset of skin diseases. The Discussion (section 4) says it analyzed multiple pollutants. Our copy does not establish that reviews typically have this narrow scope or that they target a narrow environmental-epidemiology audience. (LLM, conf=0.86)
Experimental — accuracy not yet measuredA season-specific analysis showed a higher risk of psoriasis during the cold season.
“A season-specific analysis showed a higher risk during the cold season [22, 69, 71].”
From Air Pollution and Skin Diseases: A Systematic Review of Epidemiological Evidence (2026) · cites this paper as [22]
The Subgroup Analyses section reports a significant association between increased PM2.5 and psoriasis outpatient visits in the cold season, but not a statistically significant association in the warm season. The Discussion and Conclusions describe stronger effects of air-pollutant exposure in cold weather. These findings concern pollution-associated psoriasis risk, not a higher overall risk of psoriasis during the cold season. (LLM, conf=0.84)
Experimental — accuracy not yet measuredExisting systematic reviews lack information on how air pollution interacts with other environmental parameters and thereby contributes to skin diseases.
“These reviews also lack information on how AP interacts with other environmental parameters and thereby contributes to skin diseases.”
From Air Pollution and Skin Diseases: A Systematic Review of Epidemiological Evidence (2026) · cites this paper as [22]
The Introduction says air pollution can contribute to skin problems, and the Discussion examines seasonal differences in its association with psoriasis. Neither section says that existing systematic reviews lack information about interactions between air pollution and other environmental factors. Searches for that review gap and for temperature, humidity, and interactions found no passage establishing the attributed claim. (LLM, conf=0.72)
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Sorted by citations
Air Pollution and Skin Diseases: A Systematic Review of Epidemiological Evidence
Singh, N., Schikowski, T., & Krutmann, J. (2026) · American Journal of Clinical Dermatology · doi:10.1007/s40257-026-01006-5 · Cited by 4 · see citing works
“A season-specific analysis showed a higher risk during the cold season [22, 69, 71].”
- Authors
- Yang, Y., Huang, B., Zhao, L., Liu, J., Han, Z., Xiao, M., Zhao, Y., Liu, C., Zhang, R., & Li, P.
- Affiliations
- Tianjin University of Technology (CN)
- Jianghan University (CN)
- Tianjin University (CN)
- Venue
- Aerosol and Air Quality Research
- Published
- 2024
- Volume
- 24
- Issue
- 10
- Pages
- 240062
- ISSN
- 1680-8584 (ISSN-L)
- 2071-1409
- OpenAlex
- W4399895104
- Cited by
- 1
- References
- 0
- Citations by year
- 2026: 1
- FWCI
- 0.04
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by
- Locations
- Aerosol and Air Quality Research (publishedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- China Postdoctoral Science Foundation (2020M670667)
- Topics
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Air Quality and Health Impacts
- Life Sciences › Immunology and Microbiology › Immunology › Psoriasis: Treatment and Pathogenesis
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Indoor Air Quality and Microbial Exposure
- Keywords
- psoriasis, ambient air pollution, short-term exposure, particulate matter, PM2.5, PM10, nitrogen dioxide, sulfur dioxide, ozone, sex differences, seasonal variation
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