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| Evolution and evaluation of air quality in Hangzhou and its surrounding area during the G20 summit |
| ZHAO Hui1,2, ZHENG You-fei1,2,3, WEI Li3, GUAN Qing3, WANG Zhan-shan4 |
1. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China;
3. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science & Technology, Nanjing 210044, China;
4. Beijing Municipal Environmental Monitoring Center, Beijing 100048, China |
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Abstract In order to realize air quality status in Hangzhou and its surrounding cities during the G20 summit, evaluate the effects of the implementation of safeguard measures. The concentration of air pollutants were analyzed based on pollutants observation sites in Hangzhou City and its surrounding cities from August 24, 2016 to September 6, 2016, and compared with that in 2015. The results showed that:①During the period of the safeguard, the average concentrations of PM2.5, PM10, SO2, NO2, CO and O3 were 31.52μg/m3, 46.55μg/m3, 8.92μg/m3, 15.22μg/m3, 0.62mg/m3 and 113.98μg/m3, respectively. ②Compared with the same time in 2015, the average concentrations of PM2.5, PM10, SO2, NO2 and CO were decreased by 40.16%, 37.71%, 25.98%, 56.30% and 30.34%, respectively, the average concentrations of O3 was increased by 19.89% during the safeguard period. ③Diurnal variation of pollutants are similar in three periods, the same time in 2015>the safeguard period in 2016>the G20 summit period, except for ozone. ④The concentration of ozone showed a significant increase and other air pollutants showed a significant decline in space, compared to the same time in 2015, the spatial difference of PM10 and PM2.5 were small, the spatial difference of SO2 and NO2 were big. ⑤Safeguard measures were taken to ensure that the air quality in Hangzhou and its surrounding cities had been improved during the G20 summit.
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Received: 17 October 2016
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