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Concentration and chemical characteristics of PM2.5 in Beijing, China: 2001–2002

2005; Elsevier BV; Volume: 355; Issue: 1-3 Linguagem: Inglês

10.1016/j.scitotenv.2005.03.001

1879-1026

Feng Kui Duan, Keyou He, Y. Ma, Fan Yang, Xiao‐Ying Yu, Steve H. Cadle, Tommy Chan, Patricia A. Mulawa,

Vehicle emissions and performance

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 μg m−3 and 106.9 μg 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. SO42−, NO3− and NH4+ were three major ions, accounting for 37%, 23% and 20%, respectively, of the total mass of inorganic water-soluble ions.