The Spatial Distribution Characteristics Of PM_2.5 Based On GIS Platform In Industrial Sources Of Chengdu

In recent years, with the rapid economic development in Chengdu, "compound" pollution has become more and more serious, Our study aimed at providing specific research methods for the PM2.5 spatial distribution characteristics of industrial source in chengdu therefore, our study took 20 counties as the study area, selecting 1000 industries which the cumulative PM2.5 emissions accounted for more than 85% of total emissions in Chengdu, throughing the household survey and making use of annual emission declaration and quarterly emission declaration reporting as well as environmental reporting. We collected the information of industrial activity level. Besides, we made use of emission coefficient method to estimate the PM2.5 emissions, the emissions coefficient come from the national environmental protection for the fine particulate matter (PM2.5) emissions listing technical guide. Combined with the GIS platform, demonstrating the PM2.5 spatial distribution of industrial sources.Finally, based on the main sources of chengdu, proposed some suggestions and measures to control the air pollution.Through analysis, the main conclusions are as follows:(1) The total industrial PM2.5 emissions of Chengdu is 12264.14×103kg, the sources of combustion emissions is 3257.76×103kg, the sources of process emissions is 9006.38× 103kg.(2) In the view of the emissions contribution of industrial sources, the combustion emissions sources accounted for 26.56%, and the main contribution sources is come from coal combustion emission sources; the process emissions sources accounted for 73.44%, and the main contribution sources is come from the cement emission sources.(3) In the view of the spatial distribution of industrial sources, Qing Baijiang, Pengzhou, Jintang and Du Jiangyan are the major contribution counties, including the cement, steel, fertilizer and coal power plants. Jintang is major contribution county of combustion source, the emissions contribution accounted for 54.36%, mainly due to the power industry, followed by Dayi, which acounted for 13.66%, the emissions cumulative rate of Pixian, Wenjiang and Du Jiangyan is 28.08%, due to the use of coal and fuel oil. Qing Baijiang is major contribution county of process source, the emissions contribution accounted for 42.42%, mainly due to the steel and fertilizer manufacturing, followed by the Du Jiangyan and Pengzhou, the cumulative emission contribution accounted for 43.56%, main come form the source of cement production, Dayi, Shuangliu and Qionglai and so on, the cumulative emissions contribution accounted for 11.56%, jintang, Pujiang and Pixian have little process source and the cumulative emissions contribution accounted for 1.83%.