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. 2014 Mar 6;122(6):566–572. doi: 10.1289/ehp.1206458

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Percent difference in FVC and FEV₁ (and 95% CIs) associated with 1 IQR increase in air pollutant concentration, the Normative Aging Study, 1999–2009. Depending on the pollutant, the number of observations ranged from 1,259 to 1,275. Results were adjusted for age, race, height, weight, education level, smoking status, cumulative smoking, season of the medical examination, day of the week, visit number, temperature, relative humidity, asthma, chronic bronchitis, emphysema, methacholine responsiveness, corticosteroids, sympathomimetic α and β, anticholinergics. The IQR (μg/m³) was 0.6 for BC, 362 for CO, 15 for NO₂, 33 for O₃, 7 for total PM_2.5,and 5 for nontraffic PM_2.5.