Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 25, issue 21
Articles | Volume 25, issue 21
https://doi.org/10.5194/acp-25-14411-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-14411-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 21
Research article
 | 
03 Nov 2025
Research article |  | 03 Nov 2025

Assessing COVID-19 lockdowns' impacts on global urban PM2.5 air quality with observations and modeling

Claire M. Yu, Mian Chin, Qian Tan, Huisheng Bian, Peter R. Colarco, and Hongbin Yu

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Short summary
The regional lockdowns, implemented over 2020–2022 to contain the rapid spread of the COVID-19 disease, inadvertently created a natural laboratory for investigating the effect of reducing anthropogenic emissions on urban air quality in unprecedentedly large temporal and spatial scales. In this study, we analyzed multi-year surface PM2.5 data in 21 cities around the globe, complemented by a set of global aerosol modeling experiments to assess the effect of the lockdown emission reductions on PM2.5. 
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