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Title: Increasing external effects negate local efforts to control ozone air pollution : a case study of Hong Kong and implications for other Chinese cities
Authors: Xue, LK
Wang, T 
Louie, PKK
Luk, CWY
Blake, DR
Xu, Z
Issue Date: 2014
Publisher: American Chemical Society
Source: Environmental science & technology, 2014, v. 48, no. 18, p. 10769-10775 How to cite?
Journal: Environmental science & technology 
Abstract: It is challenging to reduce ground-level ozone (O-3) pollution at a given locale, due in part to the contributions of both local and distant sources. We present direct evidence that the increasing regional effects have negated local control efforts for O-3 pollution in Hong Kong over the past decade, by analyzing the daily maximum 8 h average O-3 and Ox (=O-3+NO2) concentrations observed during the high O-3 season (September-November) at Air Quality Monitoring Stations. The locally produced Ox showed a statistically significant decreasing trend over 2002-2013 in Hong Kong. Analysis by an observation-based model confirms this decline in in situ Ox production, which is attributable to a reduction in aromatic hydrocarbons. However, the regional background O-x transported into Hong Kong has increased more significantly during the same period, reflecting contributions from southern/eastern China. The combined result is a rise in O-3 and a nondecrease in O-x. This study highlights the urgent need for close cross-boundary cooperation to mitigate the O-3 problem in Hong Kong. China's air pollution control policy applies primarily to its large cities, with little attention to developing areas elsewhere. The experience of Hong Kong suggests that this control policy does not effectively address secondary pollution, and that a coordinated multiregional program is required.
ISSN: 0013-936X
EISSN: 1520-5851
DOI: 10.1021/es503278g
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