Effects on Fine Particles by the Continued High Temperature Weather in Beijing
夏季持续高温天气对北京市大气细粒子(PM2.5)的影响

The continued high temperature weather (CHTW) appeared in Beijing since June 23 1999. The measurements showed the PM2.5 mass concentrations were 2 to 3 times of that in non CHTW period. However the diffusion conditions were still fine in these days. Both the highest hourly concentrations of O3 and the SO42- composition in PM2.5 can identify that the photochemical action was very active. It is the very reason to produce more fine particles in atmosphere.