Impact of the transport of atmospheric pollutants from the Yangtze River Delta on the air quality in Shanghai.

Impacts of the transport of atmospheric pollutants from Yangtze River Delta on the air quality of Shanghai in 2004 were simulated using MM5/CMAQ.Contributions of concentration from regional and local sources were qualified.The impacts on air quality of Shanghai from the local and regional sources were dependent on the different seasons.The impacts from the primary and secondary pollutants were also different.The contributions of SO2 in Shanghai from outside the city were 7%~17%,while those of SO42-ranged from 60%~70%.The contribution of SO2 in Shanghai from outside the city increased significantly with heights nonlinearly in general,while those of SO42-had no significant variations with heights.