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The Community Multiscale Air quality modeling system was used to study the distribution of air pollutants during an air pollution process during May 19th to 20th,2010.The meteorological environment and the impact of the major emission sources on the concentration of NO2,SO2,PM10,as well as the components in PM2.5,were simulated.And the comparison of observation and simulation indicated that the modeling system could well simulate the variations of pollutants in Shanghai.