Abstract
Acute effects of outdoor air pollution on asthma exacerbations may vary by asthma phenotype (allergic vs nonallergic). Associations of ambient PM2.5 and ozone concentrations with acute asthma visits (office, urgent, emergency, and hospitalization) were investigated using electronic medical records. International Classification of Disease codes were used to identify asthmatics, and classify them based on the presence or absence of an allergic comorbidity in their medical records. Daily 24-h average PM2.5, 8-h maximum ozone, and mean temperature were obtained from a centralized monitor. Using a time-stratified case-crossover approach, pollutant concentrations were modeled using moving averages and distributed lag nonlinear models (lag 0–6) to examine lag associations and nonlinear concentration–response. The adjusted odds ratios for a 10 µg/m3 increase in 3-day moving average (lag 0–2) PM2.5 in the two-pollutant models among patients with and without allergic comorbidities were 1.10 (95% confidence interval [CI]: 1.07, 1.13) and 1.05 (95% CI: 1.02, 1.09), respectively; and for a 20 ppb increase in 3-day moving average (lag 0–2) ozone were 1.08 (95% CI: 1.02, 1.14) and 1.00 (95% CI: 0.95, 1.05), respectively. Estimated odds ratios among patients with allergic comorbidities were consistently higher across age, sex, and temperature categories. Asthmatics with an allergic comorbidity may be more susceptible to ambient PM2.5 and ozone.
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Acknowledgements
The authors thank Gai Elhanan from the Renown Institute for Health Innovation and Andrew N. Joros from the Applied Innovation Center, Desert Research Institute.
Funding
WJM and JJG are funded through a grant from Renown Health to JJG; the Applied Innovation Center at DRI is funded through a grant from the Nevada Governor’s Office of Economic Development to JJG.
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Rosenquist, N.A., Metcalf, W.J., Ryu, S.Y. et al. Acute associations between PM2.5 and ozone concentrations and asthma exacerbations among patients with and without allergic comorbidities. J Expo Sci Environ Epidemiol 30, 795–804 (2020). https://doi.org/10.1038/s41370-020-0213-7
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DOI: https://doi.org/10.1038/s41370-020-0213-7
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