Figure 1From: Air pollution and lung function among susceptible adult subjects: a panel study Scatter plot of ambient* PM 2.5 and indoor** concentrations (μg/m 3 ), by season †and home ‡ *Averages of PM2.5 24 h concentrations (μg/m3) at two sites (Villa Ada and ISS). **PM2.5 24 h indoor concentrations (μg/m3) in each home participating in the side validation study. †Spring = 1 and Winter = 2. ‡1 to 5.Back to article page