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. 2022 Aug 2;9:466. doi: 10.1038/s41597-022-01488-y

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© The Author(s) 2022

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — Scatterplot showing observed vs. predicted surface PM_2.5 for the full model from a LOOCV representing completely independent validation. A regression line forced through the origin is show as a dashed line gave a slope of 0.98 with a standard error of 0.0004. The solid line shows 1:1. R² = 0.554.