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

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Fig. 2 — PM₁₀ daily mean concentrations for the selected Lombardy Region cities. Data about PM₁₀ concentrations are reported starting from February 10, 2020, considering that the sanitary emergency appeared nearly 20 days later. This allows to take into account the incubation time of the virus, that is reported to be of 7–14 days.