Figure 1.
Particulate matter with aerodynamic size less than or equal to 2.5 μm (PM2.5) and NO2 concentrations associated with severe exacerbations. Adjusted models include adjustment for age, sex, education, season of sampling, and baseline prebronchodilator % predicted FEV1. PM2.5 and NO2 were included in models simultaneously to account for independent effects of each pollutant. Bedroom and main living area models run separately. Circles represent odds ratios in the main living area; squares represent odds ratios in the bedroom. Bars represent 95% confidence intervals. *P < 0.05.