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. 2022 Jun 24;9:361. doi: 10.1038/s41597-022-01467-3

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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. 2 — Time series of the CO₂-USA data synthesis data set. The columns show CO₂ (left), CH₄ (middle), and CO (right) while the rows show the CO₂-USA cities in alphabetical order. Each colored line represents an inlet at a site while the thicker black lines are the background mole fractions (shown for species/cities where a published background is available). BAAQMD: Bay Area Air Quality Management District. BEACO₂N: Berkeley Environmental Air-quality & CO₂ Network.