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. 2020 Aug 25;11:4229. doi: 10.1038/s41467-020-17987-8

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© The Author(s) 2020

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. 3 — a The changes of average annual value of particulate matter of <2.5 μm (PM_2.5) during 2013–2018 in 31 provinces of China. b The changes of average annual value of particulate matter of <10 μm (PM₁₀) during 2013–2018 in 31 provinces of China. c The changes of average annual value of sulfur dioxide (SO₂) during 2013–2018 in 31 provinces of China. d The changes of average annual value of nitrogen dioxide (NO₂) during 2013–2018 in 31 provinces of China. e The changes of average annual value of ozone (O₃) during 2013–2018 in 31 provinces of China. f The changes of average annual value of carbon monoxide (CO) during 2013–2018 in 31 provinces of China. Choropleth maps of average annual value of air pollutants by region. Red means over China guidelines II (issued 2018); Blue: means below China guidelines II. Depth of color denotes air pollutants concentration. Source data are provided as a Source Data file deposited on a publicly available website (10.6084/m9.figshare.12237596.v2).