Source analysis of Guangzhou air pollutants by numerical simulation in the Asian Games Period

The Nested Air Quality Prediction Model System (NAQPMS) with an on-line tracer tagging module was applied to simulate air quality over Guangzhou in November 2006 in preparation for the Asian Games to be held in November 2010. The contribution of emissions from different cities in the Pearl River Delta to NO2,SO2 and PM10 concentrations was quantified for three receptor regions: Guangzhou district,Guangzhou urban area and at 6 additional observation stations set up for the Asian Games. The results indicate that NAQPMS can reproduce the evolution of NO2,SO2 and PM10 concentrations over Guangzhou reasonably well. Air pollutants over the three receptor regions mainly come from local emissions,with the contributions from Dongguan larger than those from other neighboring cities. Of the three receptor regions,the Guangzhou urban area is the most significantly affected by local emissions,with monthly average contributions to NO2,SO2 and PM10 concentrations of 89. 5% 、75. 4% and 86. 7% . Emissions from Dongguan have a larger impact on the concentration of air pollutants at the 6 additional observation stations set up for the Asian Games than at the other receptor regions,with monthly average contributions to NO2,SO2 and PM10 concentrations of 9. 3% ,23. 8% and 21. 7% ,and the maximum daily average contributions are as high as 19. 3% ,40. 2% and 48. 7% . Therefore in order to effectively improve the air quality around Asian Games venues,the government should take effective measures to control emissions from surrounding cities,especially Dongguan,as well as reducing local emissions in Guangzhou.