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Impact of city lockdown on the air quality of COVID-19-hit of Wuhan city.
Sci Total Environ. 2020 Nov 10; 742:140556.ST

Abstract

A series of strict lockdown measures were implemented in the areas of China worst affected by coronavirus disease 19, including Wuhan, to prevent the disease spreading. The lockdown had a substantial environmental impact, because traffic pollution and industrial emissions are important factors affecting air quality and public health in the region. After the lockdown, the average monthly air quality index (AQI) in Wuhan was 59.7, which is 33.9% lower than that before the lockdown (January 23, 2020) and 47.5% lower than that during the corresponding period (113.6) from 2015 to 2019. Compared with the conditions before the lockdown, fine particulate matter (PM2.5) decreased by 36.9% and remained the main pollutant. Nitrogen dioxide (NO2) showed the largest decrease of approximately 53.3%, and ozone (O3) increased by 116.6%. The proportions of fixed-source emissions and transported external-source emissions in this area increased. After the lockdown, O3 pollution was highly negatively correlated with the NO2 concentration, and the radiation increase caused by the PM2.5 reduction was not the main reason for the increase in O3. This indicates that the generation of secondary pollutants is influenced by multiple factors and is not only governed by emission reduction.

Authors+Show Affiliations

Collaborative Innovation Center for Western Ecological Safety, Lanzhou University, Lanzhou 730000, China.Collaborative Innovation Center for Western Ecological Safety, Lanzhou University, Lanzhou 730000, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China. Electronic address: hjp@lzu.edu.cn.Institute of Earth Environment, Chinese Academy of Sciences, Xian 710061, China.Collaborative Innovation Center for Western Ecological Safety, Lanzhou University, Lanzhou 730000, China.Gansu Province Environmental Monitoring Center, Lanzhou, 730000, China.Collaborative Innovation Center for Western Ecological Safety, Lanzhou University, Lanzhou 730000, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32634686

Citation

Lian, Xinbo, et al. "Impact of City Lockdown On the Air Quality of COVID-19-hit of Wuhan City." The Science of the Total Environment, vol. 742, 2020, p. 140556.
Lian X, Huang J, Huang R, et al. Impact of city lockdown on the air quality of COVID-19-hit of Wuhan city. Sci Total Environ. 2020;742:140556.
Lian, X., Huang, J., Huang, R., Liu, C., Wang, L., & Zhang, T. (2020). Impact of city lockdown on the air quality of COVID-19-hit of Wuhan city. The Science of the Total Environment, 742, 140556. https://doi.org/10.1016/j.scitotenv.2020.140556
Lian X, et al. Impact of City Lockdown On the Air Quality of COVID-19-hit of Wuhan City. Sci Total Environ. 2020 Nov 10;742:140556. PubMed PMID: 32634686.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Impact of city lockdown on the air quality of COVID-19-hit of Wuhan city. AU - Lian,Xinbo, AU - Huang,Jianping, AU - Huang,Rujin, AU - Liu,Chuwei, AU - Wang,Lina, AU - Zhang,Tinghan, Y1 - 2020/06/30/ PY - 2020/05/06/received PY - 2020/06/24/revised PY - 2020/06/25/accepted PY - 2020/7/8/pubmed PY - 2020/9/12/medline PY - 2020/7/8/entrez KW - AQI KW - COVID-19 KW - Lockdown KW - NO(2) KW - O(3) KW - PM(2.5) SP - 140556 EP - 140556 JF - The Science of the total environment JO - Sci Total Environ VL - 742 N2 - A series of strict lockdown measures were implemented in the areas of China worst affected by coronavirus disease 19, including Wuhan, to prevent the disease spreading. The lockdown had a substantial environmental impact, because traffic pollution and industrial emissions are important factors affecting air quality and public health in the region. After the lockdown, the average monthly air quality index (AQI) in Wuhan was 59.7, which is 33.9% lower than that before the lockdown (January 23, 2020) and 47.5% lower than that during the corresponding period (113.6) from 2015 to 2019. Compared with the conditions before the lockdown, fine particulate matter (PM2.5) decreased by 36.9% and remained the main pollutant. Nitrogen dioxide (NO2) showed the largest decrease of approximately 53.3%, and ozone (O3) increased by 116.6%. The proportions of fixed-source emissions and transported external-source emissions in this area increased. After the lockdown, O3 pollution was highly negatively correlated with the NO2 concentration, and the radiation increase caused by the PM2.5 reduction was not the main reason for the increase in O3. This indicates that the generation of secondary pollutants is influenced by multiple factors and is not only governed by emission reduction. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/32634686/Impact_of_city_lockdown_on_the_air_quality_of_COVID_19_hit_of_Wuhan_city_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(20)34078-X DB - PRIME DP - Unbound Medicine ER -