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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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Average prediction error for each state during the same prediction period (January 1 to April 23) for 2019 (no pandemic, red) and 2020 (pandemic, blue), for the PM_2.5 prediction model (the circles are connected by the dotted line for improved visualization, no other intention is associated in this connection).