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. 2012 Sep 24;120(11):1619–1626. doi: 10.1289/ehp.1104785

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Number and percentage of exacerbations attributable to changes in pollutant levels under different exposure scenarios. Scenario 2 assumes a 3.6% decrease in children living near major roads and a 20% decrease in regional pollution. Scenario 3 assumes a 3.6% increase in children living near major roads and a 20% decrease in regional pollution. Regional pollution is represented by NO₂ for all outcomes except O₃ for school absences. Bars to the left and right of zero represent reductions and increases in the burden of asthma exacerbation, respectively, compared with baseline. (A) Bronchitis episodes, (B) hospital admissions, (C) emergency department visits, (D) clinic visits, and (E) school absences.