9He K B, Yang F M, Ma Y L, et al. The characteristics of PM2.5 in Beijing, China [ J ]. Atmospheric Environment, 2001, 35 ( 29 ) : 4959-4970.
10Wang T, Cheung V T F, .Anson M, et al. Ozone and related gaseous pollutants in the boundary layer of eastern China: Overview of the recent measurements at a rural site [J]. Geophysical Research Letters, 2001, 28(12) : 2373-2376.
