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Assessing the Impact of Lockdown on Atmospheric Ozone Pollution Amid the First Half of 2020 in Shenyang, China

Author

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  • Liyuan Wang

    (College of New Energy and Environment, Jilin University, Changchun 130012, China)

  • Ju Wang

    (College of New Energy and Environment, Jilin University, Changchun 130012, China)

  • Chunsheng Fang

    (College of New Energy and Environment, Jilin University, Changchun 130012, China)

Abstract

During the eruption of COVID-19, a citywide lockdown was executed from 26 January to 23 March 2020, in Shenyang, in which the ozone pollution has recorded significant variations. This paper mainly anatomized the comprehensive characteristics and evolution trends of ozone pollution based on the lockdown period in the first half of 2020. Using the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model and cluster analysis method to establish backward trajectories and channels, the spatial transport process of ozone in the preset period and the causation of typical ozone pollution events were investigated in depth. The results demonstrated that: The ozone concentration pollution in the first half of 2020 was increased than last year. During the lockdown period, the basic pollutants levels were lower than that in pre-lockdown under different proportions, except O 3 maximum 8-h moving average (MDA8) was increased by 69.7%, accompanied by the delay of daily peak value, increased pollution days and longer pollution cycle. The typical pollution events were highly consistent with the evolution path of fine aerosol compelled by extreme weather. The ozone concentration and the atmospheric oxidation capacity can be stably maintained at a low level when NO 2 concentration remained at 50–70 μg/m 3 , no matter how much the AQI was. Meanwhile, ozone concentration in the downwind suburban was as low as the central city and soared in few stations amid post-lockdown, simultaneous the correlation between ozone and other pollutants converted from negative to positive. The trajectory indicated that the pollution sources during the lockdown and pre-lockdown were basically Southern Russia, Inner Mongolia, and the three provinces of Northeast China, the pollution from the Bohai Sea provoked ozone pollutants in Shenyang to rebound briskly amid post-lockdown, the pollution of neighboring countries and areas would have a stronger impact on air quality under the effect of lockdown.

Suggested Citation

  • Liyuan Wang & Ju Wang & Chunsheng Fang, 2020. "Assessing the Impact of Lockdown on Atmospheric Ozone Pollution Amid the First Half of 2020 in Shenyang, China," IJERPH, MDPI, vol. 17(23), pages 1-23, December.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:23:p:9004-:d:455531
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    References listed on IDEAS

    as
    1. Wang, Junfeng & Xu, Xiaoya & Wang, Shimeng & He, Shutong & He, Pan, 2021. "Heterogeneous effects of COVID-19 lockdown measures on air quality in Northern China," Applied Energy, Elsevier, vol. 282(PA).
    2. Iván Y. Hernández-Paniagua & Rodrigo Lopez-Farias & José J. Piña-Mondragón & Juan A. Pichardo-Corpus & Olivia Delgadillo-Ruiz & Arnoldo Flores-Torres & Agustín García-Reynoso & Luis G. Ruiz-Suárez & A, 2018. "Increasing Weekend Effect in Ground-Level O 3 in Metropolitan Areas of Mexico during 1988–2016," Sustainability, MDPI, vol. 10(9), pages 1-18, September.
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    Cited by:

    1. Chunsheng Fang & Liyuan Wang & Zhuoqiong Li & Ju Wang, 2021. "Spatial Characteristics and Regional Transmission Analysis of PM 2.5 Pollution in Northeast China, 2016–2020," IJERPH, MDPI, vol. 18(23), pages 1-15, November.

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