title: Concentration and chemical characteristics of PM2.5 in Beijing, China: 2001-2002.
abstract: 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.
authors.affiliation: Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, P.R. China.
authors.forename: F K
authors.initials: FK
authors.lastname: Duan
authors.forename: K B
authors.initials: KB
authors.lastname: He
authors.forename: Y L
authors.initials: YL
authors.lastname: Ma
authors.forename: F M
authors.initials: FM
authors.lastname: Yang
authors.forename: X C
authors.initials: XC
authors.lastname: Yu
authors.forename: S H
authors.initials: SH
authors.lastname: Cadle
authors.forename: T
authors.initials: T
authors.lastname: Chan
authors.forename: P A
authors.initials: PA
authors.lastname: Mulawa
mesh_terms: 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
chemical_list: D000393:Air Pollutants; D004391:Dust; D007287:Inorganic Chemicals; D002244:Carbon