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Covid-19 cases and ultraviolet radiation in winter 2020.
Global Covid-19 cases and ultraviolet radiation in winter 2020. Red bars show average daily cases from November 1, 2020 - December 2, 2020 (data from Johns Hopkins University and are either national or subnational depending on data availability). The map shows average UV during the same time period, with yellows showing high UV and oranges showing lower UV. (Image courtesy of Tamma Carleton, Jules Cornetet, Peter Huybers, Kyle C. Meng, and Jonathan Proctor)
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