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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) Normalised weekly profiles of anthropogenic NOx emissions over the U.S. used in simulations R1 and R2. (b) Mean normalised weekly NO₂ cycle for all U.S. cities (weighted by population) from OMI (2005–2017, red) and TROPOMI (orange), and from model runs R1 (black) and R2 (light blue). Dark red line: average OMI cycle for 2005–2017; pale lines: individual years. The normalised column on Sunday is given inset. (c) Same as b for individual cities ranked according to the population of their urban areas (en.wikipedia.org/wiki/List_of_United_States_urban_areas).