| Title: | Enhanced atmospheric oxidation capacity and associated ozone increases during COVID-19 lockdown in the Yangtze River Delta |
| Author(s): | Wang Y; Zhu S; Ma J; Shen J; Wang P; Wang P; Zhang H; |
| Address: | "Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, USA. Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong 99907, China. Electronic address: peng.ce.wang@polyu.edu.hk. Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China; Institute of Eco-Chongming (IEC), Shanghai 200062, China. Electronic address: zhanghl@fudan.edu.cn" |
| DOI: | 10.1016/j.scitotenv.2020.144796 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Print) 0048-9697 (Linking) |
| Abstract: | "Aggressive air pollution control in China since 2013 has achieved sharp decreases in fine particulate matter (PM(2.5)), along with increased ozone (O(3)) concentrations. Due to the pandemic of coronavirus disease 2019 (COVID-19), China imposed nationwide restriction, leading to large reductions in economic activities and associated emissions. In particular, large decreases were found in nitrogen oxides (NO(x)) emissions (>50%) from transportation. However, O(3) increased in the Yangtze River Delta (YRD), which cannot be fully explained by changes in NO(x) and volatile organic compound (VOCs) emissions. In this study, the Community Multi-scale Air Quality model was used to investigate O(3) increase in the YRD. Our results show a significant increase of atmospheric oxidation capacity (AOC) indicated by enhanced oxidants levels (up to +25%) especially in southern Jiangsu, Shanghai and northern Zhejiang, inducing the elevated O(3) during lockdown. Moreover, net P(HO(x)) of 0.4 to 1.6 ppb h(-1) during lockdown (Case 2) was larger than the case without lockdown (Case 1), mainly resulting in the enhanced AOC and higher O(3) production rate (+12%). This comprehensive analysis improves our understanding on AOC and associated O(3) formation, which helps to design effective strategies to control O(3)" |
| Keywords: | *Air Pollutants/analysis *Air Pollution *covid-19 China Communicable Disease Control Environmental Monitoring Humans *Ozone/analysis Rivers SARS-CoV-2 Atmospheric oxidation capacity Cmaq Covid-19 Ozone Yrd; |
| Notes: | "MedlineWang, Yu Zhu, Shengqiang Ma, Jinlong Shen, Juanyong Wang, Pengfei Wang, Peng Zhang, Hongliang eng Netherlands 2021/01/12 Sci Total Environ. 2021 May 10; 768:144796. doi: 10.1016/j.scitotenv.2020.144796. Epub 2021 Jan 7" |
