Abstract
Weekly PM 2.5 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 PM 2.5 were determined. Analyses including elemental composition, water-soluble ions, and organic and elemental carbon were performed. The annual average concentrations of PM 2.5 were 96.5 μg m −3 and 106.9 μg m −3 at CGZ and HU site, respectively. More than 80% of the PM 2.5 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 PM 2.5 mass concentrations at CGZ and THU site, respectively. SO 4 2−, NO 3 − and NH 4 + were three major ions, accounting for 37%, 23% and 20%, respectively, of the total mass of inorganic water-soluble ions.
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