Articles | Volume 21, issue 11
Research article
09 Jun 2021
Research article |  | 09 Jun 2021

Modeling the impact of COVID-19 on air quality in southern California: implications for future control policies

Zhe Jiang, Hongrong Shi, Bin Zhao, Yu Gu, Yifang Zhu, Kazuyuki Miyazaki, Xin Lu, Yuqiang Zhang, Kevin W. Bowman, Takashi Sekiya, and Kuo-Nan Liou

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Cited articles

Ahmadov, R., McKeen, S. A., Robinson, A. L., Bahreini, R., Middlebrook, A. M., de Gouw, J. A., Meagher, J., Hsie, E. Y., Edgerton, E., Shaw, S., and Trainer, M.: A volatility basis set model for summertime secondary organic aerosols over the eastern United States in 2006, J. Geophys. Res.-Atmos., 117, D06301,, 2012. 
Amann, M., Kiesewetter, G., Schöpp, W., Klimont, Z., Winiwarter, W., Cofala, J., Rafaj, P., Höglund-Isaksson, L., Gomez-Sabriana, A., and Heyes, C.: Reducing global air pollution: the scope for further policy interventions, Philos. T. Roy. Soc. A, 378, 20190331,, 2020. 
Archer, C. L., Cervone, G., Golbazi, M., Al Fahel, N., and Hultquist, C.: Changes in air quality and human mobility in the US during the COVID-19 pandemic, Bull. Atmos. Sci. Technol., 1, 491–514,, 2020. 
Bashir, M. F., Bilal, B. M., and Komal, B.: Correlation between environmental pollution indicators and COVID-19 pandemic: A brief study in Californian context, Environ. Res., 187, 109652,, 2020. 
Bekbulat, B., Apte, J. S., Millet, D. B., Robinson, A., Wells, K. C., and Marshall, J. D.: PM2.5 and Ozone Air Pollution Levels Have Not Dropped Consistently Across the US Following Societal Covid Response, ChemRxiv, 12275603,, 2020. 
Short summary
We use the COVID-19 pandemic as a unique natural experiment to obtain a more robust understanding of the effectiveness of emission reductions toward air quality improvement by combining chemical transport simulations and observations. Our findings imply a shift from current control policies in California: a strengthened control on primary PM2.5 emissions and a well-balanced control on NOx and volatile organic compounds are needed to effectively and sustainably alleviate PM2.5 and O3 pollution.
Final-revised paper