基于区域多尺度空气质量模型的杭州市大气污染的来源解析

Source apportionment of air pollution in Hangzhou city based on CMAQ

采用"零置法",以区域多尺度空气质量模型为工具对杭州市大气污染的来源进行了解析。模拟对不同区域传输贡献结果表明,杭州市主城区的NO2、SO2、PM2.5中来自本地的污染分别为54.37%、58.67%、49.86%,其他很大部分则来自外来输送,可见对空气质量的改善需建立区域间的联防联控;通过对不同行业污染形成的分担率分析可知,机动车尾气是杭州市污染的重要来源,对NO2、SO2、PM2.5的贡献分别有64.51%、22.41%、33.99%,要减轻杭州市大气污染需对机动车尾气污染采取控制措施。

The source apportionment of air pollution in Hangzhou city was conducted by adopting the zero setting method with the tool of the Community Multi-scale Air Quality（ CMAQ） modeling system. Simulations about the transport contribution from different regions showed that local emissions contributed only 54. 37 %,58. 67 %,49. 86 % to the total NO2,SO2,PM2. 5formation. Most pollutants were transported from other regions. It could be concluded that regionaljoint control policies were required for the improvements of air quality. Researches on the sharing rate of different departments to contamination indicated that vehicle exhaust was an important pollution source in Hangzhou,which contributed 64. 51 % 、22. 41 % 、33. 99 % to NO2,SO2,PM2. 5formation,respectively. Controlling emissions from motor vehicles was one of the most effective measures to reduce air pollution in Hangzhou.