Analysis of the Contribution of Different Sources to SO2 Concentration in the Shanghai Expo Planning Area

Based on the statistical analysis on the emission of main air pollution sources, ADMS-Urban was used to simulate the distribution of SO
₂
concentration in the Shanghai Expo area. The effects of wind direction, wind speed, clouds coverage and rainfall on the emission of SO
₂
concentration were investigated. The results show that the Yangshupu power plant gave the most contribution to SO
₂
concentration in the Shanghai Expo planning area. Clouds coverage can restrain the dispersion of the air pollutants, while rainfall can wash them away reducing the pollutants concentration more effectively than the former. It has also been found that at the wind direction of 36.8° or 190.8°, the SO
₂
concentration in the Shanghai Expo planning area exceeded the standards, the air quality in the Shanghai Expo planning area is the worst.