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《Chinese Journal of Environmental Engineering》 2008-09
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A comparative study on gaseous air pollutants in Beijing and London

Ji Dongsheng Wang Yuesi Sun Yang Ma Zhiqiang (Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029)  
Urban air-quality problem has received increasing attention.To evaluate air quality in Beijing and London,the measurement data of the gaseous air pollutants were analyzed comparatively including O3,NOx,SO2 and CO from August 2004 to December 2005.The results showed that the accumulative number of days or hours in Beijing was more than that in London above WHO-AQG,air quality EU threshold values,NAAQS or CEPBII.And the average concentrations of these gaseous air pollutants in Beijing were higher than those in London.They were 17.9±22.1×10-9,72.4±76.1×10-9,19.5±21.8×10-9,2 004.6±1 509.8×10-9 in Beijing,and 10.8±9.9×10-9,54.6±38.9×10-9,1.8±2.2×10-9,372.3±235.0×10-9 in London.The diurnal variation patterns of NOx,O3,SO2 and CO in Beijing were similar with those in London.The diurnal variation patterns of O3 showed the high concentrations during daytime,the low concentrations during night and early morning and the peak values at 14:00.The daily ranges were 31.5±30.9×10-9 and 11.1±7.7×10-9 in Beijing and London.There are two peak values in each of diurnal variations patterns of NOx,SO2 and CO.The first peak value appeared in the early morning rush hours;and the second one appeared around late evening.The highest concentrations of ozone existed in summer in Beijing,while those existed in spring in London.There are peak concentrations of NOx,SO2,CO in winter in both Beijing and London.Strong positive correlations existed between NOx and NO in both cities.And the slopes and interprets of NOx-NO lines were similar.They were 1.25 and 28.1 for Beijing,1.28 and 23.2 for London.The ratios of CO/NOx were higher than those of SO2/NOx in Beijing and London.They were 14.0,4.5 and 0.13,0.03,respectively.The ratios of CO/NOx suggested that mobile sources were the major contributor to gaseous air pollutants in both cities.But the point sources had yet influences on air quality of two mega-cities.In addition,continuous temperature inversion leaded to severe air pollution in Beijing sometimes.
【Fund】: 国家自然科学基金资助项目(40525016);; 国家“973”重点基础研究发展规划项目(2007CB407303);; 国家“863”高技术研究发展计划项目(2006AA06A301)
【CateGory Index】: X510.2
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