Air quality in Nanjing during COVID-19 lockdown period
WANG Ai-ping1, ZHU Bin2, QIN Wei1, QIN Yan-hong1, YANG Xue1, LIU Xiao-hui2
1. Jiangsu Environmental Monitoring Centre, Nanjing 210019, China; 2. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China
Abstract：In order to investigate the impact of COVID-19lockdown on air quality in Nanjing, the air pollutants observed from January 25 to February 10, in 2020 (COVID-19lockdown period) in Nanjing and its surrounding cities was analyzed. During the lockdown period with poor atmospheric diffusion conditions, the concentrations of PM2.5, PM10, NO2, SO2, and CO decreased obviously, with the value of 36, 44, 5, 22μg/m3 and 1.1mg/m3, whereas O3 increased by 4%. The net effectiveness of the emission reduction measures was calculated through comparisons of concentrations of air pollutants between and before COVID in the similar meteorological conditions. Concentrations of PM2.5, PM10, SO2, NO2 and CO decreased by 41.7%, 45.3%, 14.3%, 43.5% and 18.2%, respectively, whereas O3 increased by 4.8%. Compared to capital cities of the Yangtze River Delta in the same period, the largest decline of SO2 and the medium decline of the other pollutions were appeared in Nanjing. The diurnal variation concentration of PM2.5 and PM10 changed from double peak to single peak, due to the disappearance of nighttime sub-peak of particle. The concentration of O3 increased significantly at night, which was resulted from that sharp reduction of traffic sources weaken the titration reaction of NO to O3. The peak of O3 during the daytime depended on the variation of the ratio of VOCs to NOx due to the emission control.
智艳,罗长远.新冠肺炎疫情对中国经济的影响及其思考[J]. 学习与探索, 2020,(4):99-105. Zhi Y, Luo C Y. Impact of COVID-19 on China's economy and its thinking[J]. Learning and Exploration, 2020,(4):99-105.
[2]
王占山,李云婷,张大伟,等.2014年APEC会议期间北京市空气质量分析[J]. 环境科学学报, 2016,36(2):320-328. Wang Z S, LI Y T, Zhang D W, et al. Analysis on air quality in beijing during the 2014 APEC conference[J]. Acta Scientiae Circumstantiae, 2016,36(2):675-683.
[3]
谢放尖,李文青,喻义勇,等.南京亚青会空气质量保障回顾性评价及启示[J]. 环境监控与预警, 2014,6(2):1-4. Xie F J, Li W Q, Yu Y Y, et al. Retrospective evaluation of air quality protection measures and its inspiration during the Asian Youth Games in Nanjing[J]. Environmental Monitoring and Forewarning, 2014,6(2):1-4.
[4]
王晨波,张祥志,秦玮,等.南京青奥会空气质量保障联合观测分析研究[J]. 环境监控与预警, 2015,7(1):1-4,14. Wang C B, Zhang X Z, Qin W, et al. The research about air quality protection in the combined with observation for the second summer Youth Olympics Games[J]. Environmental Monitoring and Forewarning, 2015,7(1):1-4,14.
[5]
潘良宝,汤浩,刘晓蕾.南京青奥会空气质量保障工作的回顾与启示[J]. 环境监控与预警, 2015,7(3):1-3. Pan L B, Tang H, Liu X L. Review and revelation of air quality assurance work during the Nanjing Youth Olympic Games[J]. Environmental Monitoring and Forewarning, 2015,7(3):1-3.
[6]
赵军平,罗玲,郑亦佳,等.G20峰会期间杭州地区空气质量特征及气象条件分析[J]. 环境科学学报, 2017,37(10):3885-3893. Zhao J P, Luo L, Zheng Y J, et al. Analysis on air quality characteristics and meteorological conditions in Hangzhou during the G20 summit[J]. Acta Scientiae Circumstantiae, 2017,37(10):3885-3893.
[7]
赵辉,郑有飞,魏莉,等.G20峰会期间杭州及周边地区空气质量的演变与评估[J]. 中国环境科学, 2017,37(6):2016-2024. Zhao H, Zhen Y F, Wei L, et al. Evolution and evaluation of air quality in Hangzhou and its surrounding area during the G20 summit.[J]. China Environmental Science, 2017,37(6):2016-2024.
[8]
刘超,张恒德,张天航,等.青岛"上合峰会"期间夜间臭氧增长成因分析[J]. 中国环境科学, 2020,40(8):3332-3341. Liu C, Zhang H D, Zhang T H, et al. The causes of ozone concentration growth in the night during the "Shanghei Cooperation Organization Summit" in Qingdao[J]. China Environmental Science, 2020,40(8):3332-3341.
[9]
Chen K, Wang M, Huang C H, et al. Air pollution reduction and mortality benefit during the COVID-19outbreak in China[J]. The Lancet. Planetary health, 2020,4(6):210-212.
[10]
Le T H, Wang Y, Liu L, et al. Unexpected air pollution with marked emission reductions during the COVID-19outbreak in China[J]. Science, 2020,369(6504):702-706.
[11]
Wang P, Chen K, Zhu S, et al. Severe air pollution events not avoided by reduced anthropogenic activities during COVID-19outbreak[J]. Resources Conservation and Recycling, 2020,158:104814.
[12]
朱媛媛,汪巍,高愈霄,等.疫情期间"2+26"城市污染减排成效评估[J]. 中国环境科学, 2021,41(2):505-516. Zhu Y Y, Wang W, Gao Y X, et al. Assessment of emission reduction effect in Beijing, Tianjin and surrounding 26cities from January to March in 2020 during the epidemic of COVID-19[J]. China Environmental Science, 2021,41(2):505-516.
[13]
潘本锋,郑皓皓,李莉娜,等.空气自动监测中PM2.5与PM10"倒挂"现象特征及原因[J]. 中国环境监测, 2014,30(5):90-95. Pan B F, Zheng H H, Li L N, et al. The characteristic and reason about the reversal between PM2.5 and PM10 in ambient air quality automatic monitoring[J]. Environmental Monitoring in China, 2014,30(5):90-95.
[14]
Li L, Li Q, Huang L, et al. Air quality changes during the COVID-19lockdown over the Yangtze River Delta Region:An insight into the impact of human activity pattern changes on air pollution variation[J]. Science of The Total Environment, 2020,732:139282.
[15]
王涛,康淮钰,刘梓雅,等.基于比值和偏相关的大气污染物源识别——以2014年江苏省为例[J]. 复旦学报(自然科学版), 2016,55(4). Wang T, Kang H Y, Liu Z Y, et al. Source identification of atmospheric pollutants based on specific value and partial correlation-Taking Jiangsu Province in 2014 as an example[J]. Journal of Fudan University (Natural Science), 2016,55(4).
[16]
Li R, Mei X, Wei L, et al. Study on the contribution of transport to PM2.5 in typical regions of China using the regional air quality model RAMS-CMAQ[J]. Atmospheric Environment, 2019,214:116856.
[17]
刘厚凤,徐薇,魏敏,等.2020年初疫情管控对山东省空气质量影响的模拟[J]. 环境科学, 2021,42(3):1215-1227. Liu H F, Xu W, Wei M, et al. Impact of pollutant emission reduction on air quality during the COVID-19 pandemic control in early 2020 based on RAMS-CMAQ[J]. Environmental Science, 2021,42(3):1215-1227.
[18]
Tie X, Geng F, Guenther A, et al. Megacity impacts on regional ozone formation:observations and WRF-Chem modeling for the MIRAGE-Shanghai field campaign[J]. Atmospheric Chemistry and Physics, 2013,13(11):5655-5669.
[19]
Zhang X Y, Wang Y Q, Lin W L, et al. Changes of atmospheric composition and optical properties over Beijing-2008 Olympic monitoring campaign[J]. Bulletin of the American Meteorological Society, 2009,90(11):1633-1651.
[20]
Bao R, Zhang A. Does lockdown reduce air pollution? Evidence from 44cities in northern China[J]. Science of the Total Environment, 2020,731:139052.
[21]
Zhang R X, Zhang Y Z, Lin H P, et al. NOx emission reduction and recovery during COVID-19 in east China[J]. Atmosphere, 2020, 11(4):433.
[22]
刘安康,王红磊,陈魁,等.南京市一次霾污染过程中水溶性离子分布特征[J]. 中国环境科学, 2019,39(5):3-13. Liu A K, Wang H L, Chen K, et a. Distribution characteristics of water-soluble ions during a haze pollution process in Nanjing.[J]. China Environmental Science, 2019,39(5):3-13.
[23]
王莉莉,王跃思,吉东生,等.天津滨海新区秋冬季大气污染特征分析[J]. 中国环境科学, 2011,31(7):1077-1086. Wang L L, Wang Y S, Ji D S, et a. Characteristics of atmospheric pollutants in Tianjin Binhai New Area during autumn and winter[J]. China Environmental Science, 2011,31(7):1077-1086.
[24]
赵江伟,红都孜,王定定,等.阿克达拉大气本底站CO浓度特征及传输路径分析[J]. 环境科学与技术, 2020,43(6):115-121 Zhao J W, Hong D Z, Wang D D, et a. Analysis of CO Concentration Characteristics and Transmission Path of Akdala Atmospheric Observatory[J]. Environmental Science and Technology, 2020,43(6):115-121.
[25]
李昕,安俊琳,王跃思,等.北京气象塔夏季大气臭氧观测研究[J]. 中国环境科学, 2003,23(4):353-357. Li X, An J L, Wang Y S, et a. Studies on the measurement of atmospheric ozone in summer with Beijing meteorological tower.[J]. China Environmental Science, 2003,23(4):353-357.
