Quantifying the Impacts of COVID-19 Lockdown and Spring Festival on Air Quality over Yangtze River Delta Region
Quantifying the Impacts of COVID-19 Lockdown and Spring Festival on Air Quality over Yangtze River Delta Region
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DOI：
10.3390/atmos12060735
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发表时间：
2021-06-01
期刊：
影响因子：
2.9
通讯作者：
Liu, Cheng
中科院分区：
文献类型：
--
作者：
Javed, Zeeshan;Tanvir, Aimon;Liu, Cheng
新型冠状病毒的出现以及由此导致的世界各地封锁，由于人为活动减少，严重影响了空气质量。本研究的目的是研究新冠肺炎封锁和春节对长三角地区四个主要城市（上海、南京、合肥和杭州）空气质量的影响。现场测量了二氧化氮（NO2）、颗粒物（PM2.5）和臭氧（O-3）。1月1日至4月25日的现场测量是在COVID-19（2018-19）发生前两年、COVID-19封锁期间（2020年）和COVID-19发生后一年（2021年）进行的。结果表明，封城期间NO2和PM2.5浓度较平时明显下降，而o3浓度呈上升趋势。2020年，在一级封锁期间，二氧化氮平均下降约54%，pm2.5平均下降约36%。从2019年到2021年，整个长三角地区的二氧化氮浓度在春节假期期间大幅下降。
The emergence of the novel corona virus and the resulting lockdowns over various parts of the world have substantially impacted air quality due to reduced anthropogenic activity. The objective of this study is to investigate the impact of COVID-19 lockdown and Spring Festival on air quality of four major cities of Yangtze River Delta (YRD) region, including Shanghai, Nanjing, Hefei, and Hangzhou. In situ measurements were taken for nitrogen dioxide (NO2), particulate matter (PM2.5) and ozone (O-3). In situ measurements from 1 January to 25 April were taken two years prior to COVID-19 (2018-19), during COVID-19 lockdown (2020), and one year after the COVID-19 (2021). The results indicated that the concentration of NO2 and PM2.5 dropped considerably during the lockdown days compared to normal days while the O-3 concentration showed an upsurge. The NO2 showed reduction of about 54% on average during lockdown level 1 in 2020 whereas, PM 2.5 showed reduction of about 36% through the YRD. A substantial drop was observed in concentration of NO2 during the Spring Festival holidays throughout the YRD from 2019 to 2021.