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. 2020 May 7;186:109639. doi: 10.1016/j.envres.2020.109639

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Fig. 4 — a: Number of days of PM₁₀ exceeding 50 μg/m³ from 10th February to March 10, 2020 for the selected Lombardy and Piedmont areas. The cities identification can be found in Fig. 4b (or 4c). 4 b: COVID-19 infection cases detected on March 12, 2020 for the selected Lombardy and Piedmont areas. 4c: Percent of population resulted positive to COVID-19 on March 12, 2020 for the selected Lombardy and Piedmont areas.