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. 2020 May 14;10:7963. doi: 10.1038/s41598-020-64769-9

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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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Variability of CO₂ enhancements over cities worldwide. (a–c), Maps of the SD values at 1.0–1.5 km altitudes. Size and color of the circles indicate magnitude of the SD (see the legend in panel c). (d) Relationship of the SD at 1.0–1.5 km (red) and 4.0–4.5 km (light blue) altitude bins with city CO₂ emissions based on the ODIAC dataset^26,27. Solid lines are least square fits to the data at respective altitude bins. Airport codes are indicated for the data from 1.0–1.5 km. The error bars represent range of the SD calculated by a Bootstrap method (N = 1000).