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. 2020 Jun 22;10:10066. doi: 10.1038/s41598-020-66891-0

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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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(a) Location of studied cities. The color indicates the day of minimum according to OMI NO₂ data over 2005–2017. Open circles indicate cities for which the OMI minimum is not significant (see text). (b) Normalised NO₂ column on the day of the minimum of OMI data. (c,d) Same as a and b for TROPOMI data over May 2018-April 2019. The numerical values of OMI and TROPOMI normalised columns are given in Supplementary Table S1. The map is generated using the shapefile landareas.shp from the mapping toolbox of MATLAB version R2013a (8.1.0.604), Natick, Massachussetts, The MathWorks Inc.