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Estimated ratios of asthma prevalence and rates of asthma morbidity associated with a 1-μg/m3 difference in particulate matter less than or equal to 2.5 μm in aerodynamic diameter (PM2.5) or PM10–2.5. Single pollutant: not adjusted for PM2.5 or PM10–2.5, respectively. Adjusted for other pollutant: model including both PM2.5 and PM10–2.5. ED = emergency department.
