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Early life exposure to air pollution and incidence of childhood asthma, allergic rhinitis and eczema
Open accessAbstract
Rationale: There is growing evidence that air pollution may contribute to the development of childhood asthma and other allergic diseases. In this follow-up of the Toronto Child Health Evaluation Questionnaire (T-CHEQ) study, we examined associations between early life exposures to air pollution and incidence of asthma, allergic rhinitis and eczema from birth through adolescence. Methods: 1286 T-CHEQ participants were followed from birth until outcome (March 31, 2016) or loss to follow-up, with a mean of 17 years of follow-up. Concentrations of nitrogen dioxide (NO 2), ozone (O 3) and particulate matter with a 50% cut-off aerodynamic diameter of 2.5 µm (PM 2.5) from January 1, 1999 to December 31, 2012 were assigned to participants based on their postal codes at birth using ground observations, chemical/meteorological models, remote sensing and land-use regression models. Study outcomes included incidence of physician-diagnosed asthma, allergic rhinitis and eczema. Cox proportional hazard regression models were used to estimate hazard ratios per interquartile range of exposures and outcomes, adjusting for potential confounders. Results: Hazard ratios of 1.17 (95% CI 1.05–1.31) for asthma and 1.07 (95% CI 0.99–1.15) for eczema were observed for total oxidants (O 3 and NO 2) at birth. No significant increase in risk was found for PM 2.5. Conclusions: Exposures to oxidant air pollutants (O 3 and NO 2) but not PM 2.5 were associated with an increased risk of incident asthma and eczema in children. This suggests that improving air quality may contribute to the prevention of asthma and other allergic disease in childhood and adolescence.
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“Likewise, studies in Europe and North America have demonstrated that chronic exposure to nitrogen dioxide and ozone contributes to inflammatory dermatoses [6,7].”
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Metadata
- Authors
- To, T., Zhu, J., Stieb, D., Gray, N., Fong, I., Pinault, L., Jerrett, M., Robichaud, A., Ménard, R., van Donkelaar, A., Martin, R. V., Hystad, P., Brook, J. R., & Dell, S.
- Affiliations
- University of Toronto (CA)
- Hospital for Sick Children (CA)
- Statistics Canada (CA)
- University of California, Los Angeles (US)
- Environment and Climate Change Canada (CA)
- Dalhousie University (CA)
- Oregon State University (US)
- Corresponding author
- To, Teresa
- ORCID
- Venue
- European Respiratory Journal
- Publisher
- European Respiratory Society (ERS)
- Published
- 2019-12-05
- Volume
- 55
- Issue
- 2
- Pages
- 1900913
- ISSN
- 0903-1936 (ISSN-L)
- 1399-3003
- PMC
- PMC7031706
- OpenAlex
- W2992180822
- Cited by
- 156
- References
- 45
- Citations by year
- 2026: 12 · 2025: 18 · 2024: 29 · 2023: 31 · 2022: 24 · 2021: 28 · 2020: 14
- FWCI
- 7.13
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- European Respiratory Journal (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Funders
- Health Canada (HT421-163216/001/SS)
- Topics
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Air Quality and Health Impacts
- Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Asthma and respiratory diseases
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Indoor Air Quality and Microbial Exposure
- Keywords
- air pollution, childhood asthma, allergic rhinitis, atopic dermatitis, early life exposure, nitrogen dioxide, ozone, PM2.5, allergic diseases, air quality, land use regression
- MeSH terms
- Adolescent, Air Pollutants, Air Pollution, Asthma, Child, Eczema, Environmental Exposure, Humans, Infant, Newborn, Nitrogen Dioxide, Incidence, Particulate Matter, Rhinitis, Allergic
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