title: Speciated VOC emission inventory and spatial patterns of ozone formation potential in the Pearl River Delta, China.
abstract: The Pearl River Delta region (PRD) of China has long suffered from severe ground-level ozone pollution. Knowledge of the sources of volatile organic compounds (VOCs) is essential for ozone chemistry. In this work, a speciated VOC emission inventory was established on the basis of updated emissions and local VOC source profiles. The top 10 species, in terms of ozone formation potentials (OFPs), consisted of isoprene, mp-xylene, toluene, ethylene, propene, o-xylene, 1,2,4-trimethylbenzene, 2-methyl-2-butene, 1-butene, and alpha-pinene. These species contributed only 35.9% to VOCs emissions but accounted for 64.1% of the OFP in the region. The spatial patterns of the VOC source inventory agreed well with city-based source apportionment results, especially for vehicle emissions and industry plus VOC product-related emissions. Mapping of the OFPs and measured ozone concentrations indicated that the formation of higher ozone in the south and southeast of the PRD region differed from that in the Conghua area, a remote area in the north of the PRD. We recommend that the priorities for the control of VOC sources include motorcycles, gasoline vehicles, and solvent use because of their larger OFP contributions.
authors.affiliation: College of Environmental Science and Engineering, South China University of Technology, University Town, Guangzhou 510006, P.R. China.
authors.forename: Junyu
authors.initials: J
authors.lastname: Zheng
authors.forename: Min
authors.initials: M
authors.lastname: Shao
authors.forename: Wenwei
authors.initials: W
authors.lastname: Che
authors.forename: Lijun
authors.initials: L
authors.lastname: Zhang
authors.forename: Liuju
authors.initials: L
authors.lastname: Zhong
authors.forename: Yuanhang
authors.initials: Y
authors.lastname: Zhang
authors.forename: David
authors.initials: D
authors.lastname: Streets
mesh_terms: D002681:China; D017753:Ecosystem; D018986:Motor Vehicles; D010126:Ozone / Q000737:chemistry*; D045483:Rivers; D001335:Vehicle Emissions / Q000032:analysis*; D055549:Volatile Organic Compounds / Q000737:chemistry*
chemical_list: D001335:Vehicle Emissions; D055549:Volatile Organic Compounds; D010126:Ozone