Abstract
Gent JF, Triche EW, Holford TR, et al. JAMA . 2003;290:1859–1867 Exposure to ozone and particulate matter of ≤2.5 μm (PM2.5) in air at levels above current US Environmental Protection Agency (EPA) standards is a risk factor for respiratory symptoms among children with asthma. This study sought to examine the simultaneous effects of ozone and PM2.5, at levels below EPA standards, on daily respiratory symptoms and rescue medication use …
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