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. 2020 Apr 20;729:138474. doi: 10.1016/j.scitotenv.2020.138474

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Fig. 1A — Regression line of Log Infected 7th April, 2020 on Log days exceeding limits set for PM₁₀ or ozone according to density of population per km² in Italian province capitals, N = 55 (3 categories: <500, 500–1500, >1500 inhabitants per km²). Note: This result confirms that transmission dynamics of COVID-19 increases with the mechanism of air pollution-to-human transmission, but the rate of growth of Coronavirus disease is higher in the presence of a high density of population (i.e., >1500 inhabitants per km²) because of the mechanisms of human-to-human transmission.