The Numerical Study of Atmospheric Pollution in Beijing and Its Surrounding Regions

The influence of surrounding emission sources on Beijing's air quality is considerable to the improvement of its atmospheric environment.The regional air pollution modeling system was used to simulate the pollution transportation of regional scale from 09:00 am August 17,2002 to 08:00 am August 29,2002.Several typical pollution events were studied,and combined with the local meteorological data,the contributions of atmospheric pollutant in Beijing and its surrounding regions in each event were simulated.The result shows that in special atmospheric background,the air pollution impact on Beijing transported from mid-long distance of surrounding regions can not be neglected.The contribution of surrounding regions is more than that of Beijing in special weather conditions,i.e.when the research regions are controlled under southwestern air flow field, and the contribution of Beijing is more than that of surrounding region without the special weathers.