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. 2021 Jun 9;7(24):eabf7460. doi: 10.1126/sciadv.abf7460

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Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).

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Fig. 7 — OPE is estimated from the change in the global TOB corresponding to the regional COVID NO_x emission anomaly. The diameter of each circle represents the averaged OPE value during February to July 2020 in TgO₃/TgN, while each sector of the circle represents the relative OPE magnitude for each month. The background map shows the defined areas used in this study.