Figure 2. Associations between moving averages of air pollutant exposures before test and lung function (N = 1,694).

Abbreviations: FVC, forced vital capacity; FEV₁, forced expiratory volume in 1 second. The linear mixed models included city (Wuhan and Zhuhai) as a random effect and adjusted for age, height, body mass index, passive smoking status, asthma, heart diseases, physical activities and cooking meals at home. Associations with lung function are scaled per 10 μg/m³ increase in all the pollutants concentrations for each moving average.