title: Source apportionment of ambient volatile organic compounds in Beijing.
abstract: The ambient air quality standard for ozone is frequently exceeded in Beijing in summer and autumn. Source apportionments of volatile organic compounds (VOCs), which are precursors of ground-level ozone formation, can be helpful to the further study of tropospheric ozone formation. In this study, ambient concentrations of VOCs were continuously measured with a time resolution of 30 min in August 2005 in Beijing. By using positive matrix factorization (PMF), eight sources for the selected VOC species were extracted. Gasoline-related emissions (the combination of gasoline exhaust and gas vapor), petrochemicals, and liquefied petroleum gas (LPG) contributed 52, 20, and 11%, respectively, to total ambient VOCs. VOC emissions from natural gas (5%), painting (5%), diesel vehicles (3%), and biogenic emissions (2%) were also identified. The gasoline-related, petrochemical, and biogenic sources were estimated to be the major contributors to ozone formation potentials in Beijing.
authors.affiliation: Department of Environmental Sciences, Peking University, Beijing 100871, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Song
authors.forename: Min
authors.initials: M
authors.lastname: Shao
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Sihua
authors.initials: S
authors.lastname: Lu
authors.forename: William
authors.initials: W
authors.lastname: Kuster
authors.forename: Paul
authors.initials: P
authors.lastname: Goldan
authors.forename: Shaodong
authors.initials: S
authors.lastname: Xie
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D002849:Chromatography, Gas; D004784:Environmental Monitoring; D005410:Flame Ionization; D013058:Mass Spectrometry; D010126:Ozone / Q000737:chemistry; D001335:Vehicle Emissions / Q000032:analysis; D014835:Volatilization
chemical_list: D000393:Air Pollutants; D001335:Vehicle Emissions; D010126:Ozone