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High reduction of ozone and particulate matter during the 2016 G-20 summit in Hangzhou by forced emission controls of industry and traffic

Pengfei Li, Liqiang Wang, Ping Guo, Sciprofile linkShaocai Yu, Khalid Mehmood, Si Wang, Weiping Liu, John H. Seinfeld, Yang Zhang, David C. Wong, Kiran Alapaty, Jon Pleim, Rohit Mathur
Environmental Chemistry Letters , Volume 15, pp 709-715; doi:10.1007/s10311-017-0642-2

Abstract: Many regions in China experience air pollution episodes because of the rapid urbanization and industrialization over the past decades. Here we analyzed the effect of emission controls implemented during the G-20 2016 Hangzhou summit on air quality. Emission controls included a forced closure of highly polluting industries, and limiting traffic and construction emissions in the cities and surroundings. Particles with aerodynamic diameter lower than 2.5 µm (PM2.5) and ozone (O3) were measured. We also simulated air quality using a forecast system consisting of the two-way coupled Weather Research and Forecast and Community Multi-scale Air Quality (WRF-CMAQ) model. Results show PM2.5 and ozone levels in Hangzhou during the G-20 Summit were considerably lower than previous to the G-20 Summit. The predicted concentrations of ozone were reduced by 25.4%, whereas the predicted concentrations of PM2.5 were reduced by 56%.
Keywords: Wrf-cmaq / Air Quality Forecast / Effects of emission reductions / 2016 G-20 Summit

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