title: [Effects on fine particles by the continued high temperature weather in Beijing].
abstract: 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 SO4(2-) 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.
authors.affiliation: State Key Joint Laboratory of Environmental Simulation and Pollution Control, Center for Environmental Sciences, Peking University, Beijing 100871.
authors.forename: Yu
authors.initials: Y
authors.lastname: Song
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Tang
authors.forename: Yuanhang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Min
authors.initials: M
authors.lastname: Hu
authors.forename: Chen
authors.initials: C
authors.lastname: Fang
authors.forename: Liming
authors.initials: L
authors.lastname: Zen
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D006358:Hot Temperature; D010126:Ozone / Q000032:analysis; D010316:Particle Size; D013431:Sulfates / Q000032:analysis; D014887:Weather
chemical_list: D000393:Air Pollutants; D013431:Sulfates; D010126:Ozone