期刊
ENVIRONMENTAL HEALTH PERSPECTIVES
卷 116, 期 10, 页码 1433-1438出版社
US DEPT HEALTH HUMAN SCIENCES PUBLIC HEALTH SCIENCE
DOI: 10.1289/ehp.10968
关键词
air pollution; asthma onset; children; nitrogen dioxide; traffic
资金
- National Institute of Environmental Health Sciences [5P30ES007048, 5P01ES011627, 5P01ES009581, 1R03ES014046]
- U.S. Environmental Protection Agency [RD831861, R826708, R831845]
- California Air Resources Board [94-331]
- Hastings Foundation
BACKGROUND: The question of whether air pollution contributes to asthma onset remains unresolved. OBJECTIVES: In this study, we assessed the association between asthma onset in children and traffic-related air pollution. METHODS: We selected a sample of 217 children from participants in the Southern California Children's Health Study, a prospective cohort designed to investigate associations between air pollution and respiratory health in children 10-18 years of age. Individual covariates and new asthma incidence (30 cases) were reported annually through questionnaires during 8 years of follow-up. Children had nitrogen dioxide monitors placed outside their home for 2 weeks in the summer and 2 weeks in the fall-winter season as a marker of traffic-related air pollution. We used multilevel Cox models to test the associations between asthma and air pollution. RESULTS: In models controlling for confounders, incident asthma was positively associated with traffic Pollution, with a hazard ratio (HR) of 1.29 [95% confidence interval (CI), 1.07-1.56] across the average within-community interquartille range of 6.2 ppb in annual residential NO2. Using the total interquartile range for all measurements of 28.9 ppb increased the HR to 3.25 (95% CI, 1.35-7.85). CONCLUSIONS: In this cohort, markers of traffic-related air pollution were associated with the onset of asthma. The risks observed suggest that air pollution exposure contributes to new-onset asthma.
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