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Impacts of COVID-19 on Air Quality through Traffic Reduction

Author

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  • Hyemin Hwang

    (Environmental and Safety Engineering Department, Ajou University, Suwon 16499, Korea)

  • Jae Young Lee

    (Environmental and Safety Engineering Department, Ajou University, Suwon 16499, Korea)

Abstract

In 2020, the first case of COVID-19 was confirmed in Korea, and social distancing was implemented to prevent its spread. This reduced the movement of people, and changes in air quality were expected owing to reduced emissions. In the present paper, the impact of traffic volume change caused by COVID-19 on air quality in Seoul, Korea, is examined. Two regression analyses were performed using the generalized additive model (GAM), assuming a Gaussian distribution; the relationships between (1) the number of confirmed COVID-19 cases in 2020–2021 and the rate of change in the traffic volume in Seoul, and (2) the traffic volume and the rate of change in the air quality in Seoul from 2016 to 2019 were analyzed. The regression results show that traffic decreased by 0.00431% per COVID-19 case; when traffic fell by 1%, the PM 10 , PM 2.5 , CO, NO 2 , O 3 , and SO 2 concentrations fell by 0.48%, 0.94%, 0.39%, 0.74%, 0.16%, and −0.01%, respectively. This mechanism accounts for air quality improvements in PM 10 , PM 2.5 , CO, NO 2 , and O 3 in Seoul during 2020–2021. From these results, the majority of the reduction in pollutant concentrations in 2020–2021 appears to be the result of a long-term declining trend rather than COVID-19.

Suggested Citation

  • Hyemin Hwang & Jae Young Lee, 2022. "Impacts of COVID-19 on Air Quality through Traffic Reduction," IJERPH, MDPI, vol. 19(3), pages 1-12, February.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:3:p:1718-:d:740819
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    References listed on IDEAS

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    1. Beom-Soon Han & Kyeongjoo Park & Kyung-Hwan Kwak & Seung-Bu Park & Han-Gyul Jin & Sungju Moon & Jong-Won Kim & Jong-Jin Baik, 2020. "Air Quality Change in Seoul, South Korea under COVID-19 Social Distancing: Focusing on PM 2.5," IJERPH, MDPI, vol. 17(17), pages 1-12, August.
    2. Guojun He & Yuhang Pan & Takanao Tanaka, 2020. "The short-term impacts of COVID-19 lockdown on urban air pollution in China," Nature Sustainability, Nature, vol. 3(12), pages 1005-1011, December.
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    Cited by:

    1. Hyunjung Lee & Sookuk Park & Helmut Mayer, 2023. "Statistical Characteristics of Air Quality Index DAQx*-Specific Air Pollutants Differentiated by Types of Air Quality Monitoring Stations: A Case Study of Seoul, Republic of Korea," Sustainability, MDPI, vol. 15(11), pages 1-25, May.

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