Pollution characteristic of PM2.5 and secondary inorganic ions in Beijing-Tianjin-Hebei region
【Abstract】Beijing, Shijiazhuang and Tangshan were selected as the typical cities in the Beijing-Tianjin-Hebei region to investigate the seasonal variation characteristics of secondary water-soluble inorganic ions (SNA) and compare the pollution characteristics and physicochemical property of the secondary water-soluble ions between heavy pollution period and other periods. Then CAMx-PSAT model was applied to quantitatively analyze the contribution on PM2.5 and SNA concentration from pollution sources in BTH region during different seasons. Results showed that PM2.5 concentration in these cities decreased year by year, and the maximum of SO42−, NO3− and NH4+ concentration mostly appeared in winter at the same time, illustrating the related correlation of their concentrations. The mass concentrations of SO42−, NO3− and NH4+ increased significantly during heavy pollution period compared with other periods. The largest concentration ratio of SNA appeared in one to two days before heavy pollution days. The formation of heavy pollution was the combined effects of local pollutant emission and external source region transport. The contribution of external sources to NO3− was higher than that of SO42− and NH4+. In addition, the concentrations of PM2.5, SO42− and NO3− were mostly contributed from traffic sources, resident sources and industrial sources, and the resident sources were the most important contributor for NH4+concentration.
【Keywords】 secondary water-soluble inorganic ions; PM2.5; heavy pollution; CAMx;
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References
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ISSN:1000-6923
CN:11-2201/X
Vol 38, No. 03, Pages 801-811
March 2018
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