Figure 2
Median (left) and maximum (right) average concentrations of indoor PM by hour of the day. Curves are stratified by site and chimney construction (urban, rural with chimney, and rural without chimney). The y-axis represents summaries of average hourly concentrations (in μg/m3) of indoor PM across households. We calculated these household summaries for each hour of the day, as indicated in the x-axis.