Fig. 4.
24-hour average time-series plots for PM2.5 concentrations (μg/m3) recorded in the personal, kitchen, living room, and community monitors by season and primary heating fuel combinations.
There were 200 (22,539 person-hours), 47 (5226 person-hours) and 136 (15,147 person-hours) subjects for the “Solid fuels included”, “Clean only” and “No heating” group in summer, respectively; There were 207 (21,772 person-hours), 43 (4261 person-hours) and 112 (11,701 person-hours) subjects for the “Solid fuels included”, “Clean only” and “No heating” group in winter, respectively. Smaller plots nested within panels are “zoom-in” version of the corresponding plot, as the use of a universal y-axis limit up to 1200 with reference to the kitchen exposure levels impaired the readability of those plots.