Figure 1. Daily prevalence of wheezing in the morning and evening (A) and daily concentrations of indoor and outdoor PM2.5(LD) and stationary-site PM2.5 (24-h means) (B), from November 5, 2003 through March 24, 2004. PM2.5, particulate matter less than 2.5 µm in diameter; PM2.5(LD), PM2.5 measured using the dust monitor with a laser diode.
