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. 2021 Jan 13;9(2):104973. doi: 10.1016/j.jece.2020.104973

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Fig. 3 — Global overview of the spread of SARS-CoV-2 infection and ambient air pollution. (A) Map depicts the number of confirmed COVID-19 cases by country. (B) Map represents country-wise average PM_2.5 exposure (µg/m³), as calculated from available city data and weighted by population. The data is shown here as of Oct. 15th, 2020 from the WHO [244] and World Air Quality Index (AQI) report of 2019–20 [245], [246].