Special Issue on Air Quality in a Changed World: Regional, Ambient, and Indoor Air Concentrations from the COVID to Post-COVID Era

Qingchun Guo This email address is being protected from spambots. You need JavaScript enabled to view it.1,2, Zhaosheng Wang This email address is being protected from spambots. You need JavaScript enabled to view it.3, Zhenfang He1,4, Xinzhou Li2,5, Jingjing Meng1, Zhanfang Hou1, Jiaoxue Yang1

1 School of Geography and the Environment, Liaocheng University, Liaocheng 252000, China
2 State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
3 National Ecosystem Science Data Center, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
4 State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
5 CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China


Received: October 5, 2021
Revised: November 20, 2021
Accepted: November 23, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.210270  

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Cite this article:

Guo, Q., Wang, Z., He, Z., Li, X., Meng, J., Hou, Z., Yang, J. (2021). Changes in Air Quality from the COVID to the Post-COVID Era in the Beijing-Tianjin-Tangshan Region in China. Aerosol Air Qual. Res. 21, 210270. https://doi.org/10.4209/aaqr.210270


HIGHLIGHTS

  • AQI, PM2.5, PM10, and NO2, during the COVID 2020 is lower than those of the same period 2021.
  • AQI, PM2.5, PM10, SO2, CO, NO2, and O3 during post-COVID 2021 is lower than those of the same period 2020.
  • Clean air policies played a much stronger role in decrease of air pollution.
 

ABSTRACT


This article discussed air quality changes in the Beijing-Tianjin-Tangshan (BTT) region. The air quality index (AQI) values, and the concentrations of PM2.5, PM10, SO2, CO, NO2, and O3 in the BTT region during the COVID-19 outbreak in 2020 were, respectively, 79.4, 47.2 µg m–3, 73.4 µg m–3, 10.3 µg m–3, 0.87 mg m–3, 33.6 µg m–3, and 90.7 µg m–3. However, they were, respectively, 102.7, 61.4 µg m–3, 121.0 µg m–3, 9.0 µg m–3, 0.88 mg m–3, 40.1 µg m–3, and 84.0 µg m–3 during the same period in 2021, which is an increase of 29.2%, 30.1%, 64.8%, –12.9%, 1.94 %, 19.5%, and –7.4% compared with the values in 2020. The combined proportions of grade I and grade II during the COVID-19 outbreak in 2020 were 16.7% higher than those in the same period in 2021, so the air quality has deteriorated rapidly from 2020 to the post-COVID era in 2021. The possible reasons for poorer air quality are that the frequency of dusty weather and air pollutant discharge has increased, and meteorological conditions have been relatively unfavorable. The average AQI values, and concentrations of PM2.5, PM10, SO2, CO, NO2, and O3 during the post-COVID period in 2021 respectively decreased by 14.8%, 29.0%, 14.6%, 22.5%, 37.4%, 14.8%, and 8.7%, compared with those in 2020. It is also worth noting that all the changes in air pollution during the post-COVID era have been consistent. The combined proportions of grade I and grade II during post-COVID period in 2021 were 18.4% higher than those during the same period of 2020, which indicates that the air quality during post-COVID 2021 has obviously improved compared with those in the same period of 2020. The possible reasons are a series of clean air policies and clean air actions, as well as favorable atmospheric diffusion conditions. These results indicate that clean air policies play a very important role in improving air quality.


Keywords: COVID-19, Post-COVID, Air quality, PM2.5, PM10




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