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J Environ Manage

Title:		Ground-level ozone in the Pearl River Delta and the roles of VOC and NO(x) in its production
Author(s):		Shao M; Zhang Y; Zeng L; Tang X; Zhang J; Zhong L; Wang B;
Address:		"State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China. mshao@pku.edu.cn"
Journal Title:		J Environ Manage
Year:		2009
Volume:		20080118
Issue:		1
Page Number:		512 - 518
DOI:		10.1016/j.jenvman.2007.12.008
ISSN/ISBN:		0301-4797 (Print) 0301-4797 (Linking)
Abstract:		"In many regions of China, very rapid economic growth has been accompanied by air pollution caused by vehicle emissions. In one of these regions, the Pearl River Delta, the variations of ground-level ozone and its precursors were investigated. Overall, the ambient concentrations of NO(2) increased quickly between 1995 and 1996, but then slightly decreased due to stringent nitrogen oxide (NO(x)) emission controls. Nonetheless, ambient NO(2) levels in the Pearl River Delta remained high. The regional average concentrations of volatile organic compounds (VOCs) were 290 ppbC in summer and 190 ppbC in autumn. Local emissions and long-distance transportation of pollutants play important roles in the regional distribution of VOCs. Ambient O(3) production is significant in urban areas and also downwind of cities. The relative incremental reactivities (RIRs), determined by an observation-based model, showed that ground-level ozone formation in the Guangzhou urban area is generally limited by the concentrations of VOCs, but there are also measurable impacts of NO(x)"
Keywords:		Air/*analysis Air Pollution/*analysis China Climate Geography Nitric Oxide/analysis Nitrogen Dioxide/analysis Nitrogen Oxides/*analysis Organic Chemicals/*analysis Ozone/*analysis Rivers/*chemistry Seasons Temperature Time Factors Volatilization;
Notes:		"MedlineShao, Min Zhang, Yuanhang Zeng, Limin Tang, Xiaoyan Zhang, Jing Zhong, Liuju Wang, Boguang eng Research Support, Non-U.S. Gov't England 2008/01/22 J Environ Manage. 2009 Jan; 90(1):512-8. doi: 10.1016/j.jenvman.2007.12.008. Epub 2008 Jan 18"