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J Environ Sci (China)

Title:		Fast increasing of surface ozone concentrations in Pearl River Delta characterized by a regional air quality monitoring network during 2006-2011
Author(s):		Li J; Lu K; Lv W; Li J; Zhong L; Ou Y; Chen D; Huang X; Zhang Y;
Address:
Journal Title:		J Environ Sci (China)
Year:		2014
Volume:		26
Issue:		1
Page Number:		23 - 36
DOI:		10.1016/s1001-0742(13)60377-0
ISSN/ISBN:		1001-0742 (Print) 1001-0742 (Linking)
Abstract:		"Based on the observation by a Regional Air Quality Monitoring Network including 16 monitoring stations, temporal and spatial variations of ozone (O3), NO2 and total oxidant (O(x)) were analyzed by both linear regression and cluster analysis. A fast increase of regional O3 concentrations of 0.86 ppbV/yr was found for the annual averaged values from 2006 to 2011 in Guangdong, China. Such fast O3 increase is accompanied by a correspondingly fast NO(x) reduction as indicated by a fast NO2 reduction rate of 0.61 ppbV/yr. Based on a cluster analysis, the monitoring stations were classified into two major categories--rural stations (non-urban) and suburban/urban stations. The O3 concentrations at rural stations were relatively conserved while those at suburban/urban stations showed a fast increase rate of 2.0 ppbV/yr accompanied by a NO2 reduction rate of 1.2 ppbV/yr. Moreover, a rapid increase of the averaged O3 concentrations in springtime (13%/yr referred to 2006 level) was observed, which may result from the increase of solar duration, reduction of precipitation in Guangdong and transport from Eastern Central China. Application of smog production algorithm showed that the photochemical O3 production is mainly volatile organic compounds (VOC)-controlled. However, the photochemical O3 production is sensitive to both NO(x) and VOC for O3 pollution episode. Accordingly, it is expected that a combined NO(x) and VOC reduction will be helpful for the reduction of the O3 pollution episodes in Pearl River Delta while stringent VOC emission control is in general required for the regional O3 pollution control"
Keywords:		Air Pollutants/*analysis China Cluster Analysis *Environmental Monitoring Nitrogen Oxides/analysis Ozone/*analysis Regression Analysis Rivers;
Notes:		"MedlineLi, Jinfeng Lu, Keding Lv, Wei Li, Jun Zhong, Liuju Ou, Yubo Chen, Duohong Huang, Xin Zhang, Yuanhang eng Research Support, Non-U.S. Gov't Netherlands 2014/03/22 J Environ Sci (China). 2014 Jan 1; 26(1):23-36. doi: 10.1016/s1001-0742(13)60377-0"