Fig. 2From: Ambient air pollution is associated with pediatric pneumonia: a time-stratified case–crossover study in an urban areaOdds ratios (ORs) for IQR increments in (a) PM2.5 and (b) NO2 on lag 3 after adjustment for temperature and humidity. The x-axis represents OR with 95% confidence intervals (CIs). The warm season was from April to September. *p < 0.05. Int P, interaction p-value; IQR, interquartile rangeBack to article page