Concentration and chemical characteristics of PM2.5 in Beijing, China: 2001-2002.
Weekly PM2.5 samples were simultaneously collected at a semi-residential (Tsinghua University) and a downtown (Chegongzhuang) site in Beijing from August 2001 through September 2002. The ambient mass concentration and chemical composition of PM2.5 were determined. Analyses including elemental composition, water-soluble ions, and organic and elemental carbon were performed. The annual average concentrations of PM2.5 were 96.5 microg m(-3) and 106.9 microg m(-3) at CGZ and HU site, respectively. More than 80% of the PM2.5 mass concentrations were explained by carbonaceous species, secondary particles, crustal matters and trace elements at the two sites. Carbonaceous species were the most abundant components, constituting about 45% and 48% of the total PM2.5 mass concentrations at CGZ and THU site, respectively. SO4(2-), NO3- and NH4+ were three major ions, accounting for 37%, 23% and 20%, respectively, of the total mass of inorganic water-soluble ions.
Duan
F K
FK
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, P.R. China.
He
K B
KB
Ma
Y L
YL
Yang
F M
FM
Yu
X C
XC
Cadle
S H
SH
Chan
T
T
Mulawa
P A
PA
D000393:Air Pollutants / Q000032:analysis*; D002244:Carbon / Q000032:analysis; D002681:China; D002947:Cities; D004391:Dust / Q000032:analysis; D004784:Environmental Monitoring; D007287:Inorganic Chemicals / Q000032:analysis; D010316:Particle Size
D000393:Air Pollutants; D004391:Dust; D007287:Inorganic Chemicals; D002244:Carbon