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. 2021 Dec 7;11:23517. doi: 10.1038/s41598-021-02776-0

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Median change in PM_2.5 following the state-level emergency declaration for each state ( $Δ_{j}$ ). A negative estimated value of $Δ_{j}$ indicates that air pollution levels declined as a result of the state-level emergency declaration. This figure was created using open source software R 4.1.0 (https://cran.r-project.org/). The base US map was used by using the R package: rnaturalearthhires (). The source code (Rcode_PM25_USmap_figure3.R) to recreate this figure, please visit our GitHub page: https://github.com/NSAPH/USA-COVID-state-level-air-pollution-SARIMA-analysis.