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Analysis of Pollution Characteristics of PM2.5 in Hangzhou in Autumn and WinterChinese Full TextEnglish Full Text (MT)

YAN Renchang;LIN Xu;JIN Jiajia;XU Kaier;YE Hui;HE Xi;SHEN Jiandong;HE Jiping;ZHANG Haiyang;Hangzhou Environmental Monitoring Central Station;

Abstract: To investigate the pollution characteristics and sources apportionment of PM2.5 in Hangzhou, the national environmental monitoring PM2.5 data and meteorological data of Hangzhou during 2013-2019 were used to analyze the changes characteristics of PM2.5 concentration in the past five years.And two typical PM2.5 pollution processes, local origin and external input, were collected and analyzed for PM2.5 chemical composition and pollution source by use a single particle aerosol mass spectrometer(SPAMS) and ion chromatography analyzer data.The results showed that high PM2.5 episodes usually occurred in autumn and winter, during the period from November to the following March, because of the pollutants accumulation when the wind speed was lower than 4 m/s.If the wind speed was large and the wind direction was northeast or northwest, it was also prone to occur PM2.5 heavy pollution due to pollutants transportation.In both of local accumulation and import cases, the largest proportions of PM2.5 chemical components were NO-3,SO42- and NH+4.And the conversion rate of secondary NO-3 and SO42- increased significantly during the increase of PM2.5 concentration.The increase of NO-3 was more remarkable, and the secondary aerosol pollution was serious in Hangzhou.The source characteristics of PM2.5 indicated that the top three pollution sources contributed by PM2.5 in Hangzhou were vehicle exhaust, coal combustion and industrial process respectively.In the local accumulation case, the proportion of motor vehicle exhaust increased significantly when the PM2.5 concentration rose; and in the imported case, the proportion of motor vehicle exhaust increased significantly, and the contribution of coal-fired sources also increased slightly.
  • DOI:

    10.19316/j.issn.1002-6002.2021.06.11

  • Series:

    (B) Chemistry/ Metallurgy/ Environment/ Mine Industry

  • Subject:

    Environment Science and Resources Utilization

  • Classification Code:

    X513

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