College of Environmental Science and Engineering, South China University of Technology, University Town, Guangzhou 510006, P.R. China.
Environ Sci Technol. 2009 Nov 15;43(22):8580-6. doi: 10.1021/es901688e.
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.
中国珠江三角洲（PRD）地区长期以来一直遭受严重的地面臭氧污染。了解挥发性有机化合物（VOC）的来源对于臭氧化学至关重要。在这项工作中，我们在更新的排放和当地 VOC 源特征的基础上建立了一种特定 VOC 排放清单。根据臭氧形成潜力（OFP），排名前十的物质包括异戊二烯、间二甲苯、甲苯、乙烯、丙烯、邻二甲苯、1,2,4-三甲苯、2-甲基-2-丁烯、1-丁烯和α-蒎烯。这些物质仅占 VOC 排放的 35.9%，但占该地区 OFP 的 64.1%。VOC 源清单的空间分布与基于城市的源分配结果吻合较好，特别是对于车辆排放和工业及 VOC 产品相关排放。OFP 和实测臭氧浓度的映射表明，PRD 地区南部和东南部的臭氧形成情况与 PRD 北部偏远地区从化地区不同。我们建议将优先控制的 VOC 源包括摩托车、汽油车和溶剂使用，因为它们对 OFP 的贡献更大。
