title: Source apportionment of PM2.5 in Beijing in 2004.
abstract: Based on measurements of fine particulate matter (PM2.5, i.e., particles with an aerodynamic diameter of 2.5 microm or less) in January and August 2004, serious air pollution persists in Beijing. The chemical analysis included organic and elemental carbon, water-soluble ions, and elemental compositions. The positive matrix factorization (PMF) method was used to apportion the PM2.5 sources. The sources contributing dominantly to PM2.5 mass concentrations are coal combustion in winter and the secondary products in summer. Furthermore, the contributions from motor vehicles, road dusts and biomass burning could not be neglected. The products of biomass burning for winter heating in the area around Beijing could enter the urban area during quasi-quiescent weather conditions. In conclusion, some effective control measures were proposed to reduce the PM2.5 pollution in Beijing.
authors.affiliation: Department of Environmental Sciences, Peking University, Beijing 100871, China. songyu@pku.edu.cn
authors.forename: Yu
authors.initials: Y
authors.lastname: Song
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Tang
authors.forename: Shaodong
authors.initials: S
authors.lastname: Xie
authors.forename: Yuanhang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yongjie
authors.initials: Y
authors.lastname: Wei
authors.forename: Minsi
authors.initials: M
authors.lastname: Zhang
authors.forename: Limin
authors.initials: L
authors.lastname: Zeng
authors.forename: Sihua
authors.initials: S
authors.lastname: Lu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D002947:Cities; D003031:Coal; D004784:Environmental Monitoring; D006361:Heating; D008670:Metals / Q000032:analysis; D009566:Nitrates / Q000032:analysis; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D011210:Power Plants; D013431:Sulfates / Q000032:analysis; D001335:Vehicle Emissions
chemical_list: D000393:Air Pollutants; D003031:Coal; D008670:Metals; D009566:Nitrates; D052638:Particulate Matter; D013431:Sulfates; D001335:Vehicle Emissions