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Evolution and Assessment of the Atmospheric Composition in Hangzhou and its Surrounding Areas during the G20 Summit

Category: Urban Air Quality

Volume: 19 | Issue: 12 | Pages: 2757-2769
DOI: 10.4209/aaqr.2018.12.0481
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To cite this article:
Wu, K., Kang, P., Tie, X., Gu, S., Zhang, X., Wen, X., Kong, L., Wang, S., Chen, Y., Pan, W. and Wang, Z. (2019). Evolution and Assessment of the Atmospheric Composition in Hangzhou and its Surrounding Areas during the G20 Summit. Aerosol Air Qual. Res. 19: 2757-2769. doi: 10.4209/aaqr.2018.12.0481.

Kai Wu1,2, Ping Kang1, Xin Tie3, Shan Gu4, Xiaoling Zhang1, Xiaohang Wen1, Lingkai Kong5, Sihui Wang1, Yuzi Chen6, Weihao Pan1, Zhanshan Wang 7

  • 1 Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China
  • 2 Department of Land, Air, and Water Resources, University of California, Davis, CA 95616, USA
  • 3 Department of Earth and Environmental Sciences, University of Rochester, NY 14620, USA
  • 4 Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92617, USA
  • 5 Chunan Meteorological Bureau, Hangzhou 310007, China
  • 6 Nanjing University of Information Science and Technology, Nanjing 210044, China
  • 7 State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China


  • Variations of air pollutants and PM2.5 components were analyzed in the G20 summit.
  • Most of the air pollutants concentrations decreased but O3 concentration increased.
  • Most of the chemical components of PM2.5 decreased markedly during the G20 summit.


To evaluate the effectiveness of control strategies during the G20 Summit (August 24–September 6, 2016), five sites were selected for investigating the variation in air pollution in the city of Hangzhou and its surrounding areas. The results showed that the air quality in Hangzhou greatly improved after the implementation of strict emission controls. Compared to the same dates from the five preceding years, the G20 period exhibited low relative humidity during the early stage (August 27–31) and no significant differences in other meteorological conditions. The SO2, NO2, PM10, and PM2.5 concentrations averaged across the five sites in Hangzhou decreased by 42.6%, 57.1%, 36%, and 38.5%, respectively, although the average O3 concentration increased by 19%. These changes indicate that the emission reduction measures decreased the concentrations of several pollutants. Compared to the same dates from the previous year (August 24–September 6, 2015), the G20 period exhibited significantly decreased concentrations for most of the chemical components of PM2.5, particularly SO42–, NO3, and NH4+. Additionally, the aerosol optical depth (AOD) and the NO2 column densities were found to exhibit similar trends with that of the pollutants in this city.


Air quality Emission reduction G20 summit Ozone sensitivity

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