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. 2021 Jun 7;48(11):e2021GL092744. doi: 10.1029/2021GL092744

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© 2021. The Authors. This article has been contributed to by US Government employees and their work is in the public domain in the USA.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Moving 15‐day average of daily afternoon network‐wide means of the within‐hour standard deviation for (a) LA and (b) DC‐Balt, for three study years. Change point credible intervals are shaded pink. (c and d) Cumulative fossil‐fuel CO₂ (FFCO2) enhancements (daily afternoon network‐wide means) for each of the three years, starting on January 1 and re‐starting on March 13 (black dashed line), the date associated with the behavioral shifts reflected in Apple mobility (Apple, 2020).