ACP Atmospheric Chemistry and Physics ACP Atmos. Chem. Phys. 1680-7324 Copernicus Publications Göttingen, Germany 10.5194/acp-11-4353-2011 Characteristics of pollutants and their correlation to meteorological conditions at a suburban site in the North China Plain Xu W. Y. 1 Zhao C. S. 1 Ran L. 1 Deng Z. Z. 1 Liu P. F. 1 Ma N. 1 Lin W. L. 2 Xu X. B. 2 Yan P. 2 He X. 3 Yu J. 4 5 Liang W. D. 4 Chen L. L. 4 Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China Key Laboratory for Atmospheric Chemistry, Centre for Atmosphere Watch and Services, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China Aviation Meteorological Center, Air Traffic Management Bureau, Civil Aviation Administration of China, Beijing, China Wuqing Meteorological Bureau of Tianjin, China now at: Tanggu Meteorological Bureau of Tianjin, China 11 05 2011 11 9 4353 4369 Copyright: © 2011 W. Y. Xu et al. 2011 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://acp.copernicus.org/articles/11/4353/2011/acp-11-4353-2011.html The full text article is available as a PDF file from https://acp.copernicus.org/articles/11/4353/2011/acp-11-4353-2011.pdf

North China Plain (NCP) is one of the most densely populated regions in China and has experienced enormous economic growth in the past decades. Its regional trace gas pollution has also become one of the top environmental concerns in China. Measurements of surface trace gases, including O<sub>3</sub>, NO<sub>x</sub>, SO<sub>2</sub> and CO were carried out within the HaChi (Haze in China) project at Wuqing Meteorology Station, located between 2 mega-cities (Beijing and Tianjin) in the NCP, from 9 July 2009 to 21 January 2010. Detailed statistical analyses were made in order to provide information on the levels of the measured air pollutants and their characteristics. Gaseous air pollutant concentrations were also studied together with meteorological data and satellite data to help us better understand the causes of the observed variations in the trace gases during the field campaign. In comparison to measurements from other rural and background stations in the NCP, relatively high concentrations were detected in Wuqing, presumably due to regional mixing and transport of pollutants. Local meteorology had deterministic impacts on air pollution levels, which have to be accounted for when evaluating other effects on pollutant concentrations. Trace gas concentrations showed strong dependence on wind, providing information on regional pollution characteristics. O<sub>3</sub> mixing ratio also showed clear dependencies on temperature and relative humidity.

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