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Difference in daily average deaths and the particulate matter (PM2.5 with an aerodynamic diameter ≤ 2.5 μm; PM10, ≤ 10 μm; PM2.5–10, 2.5–10 μm) in 107 Italian provinces during March and May. (a) Differences in daily average deaths, (b) Differences in daily average PM2.5, (c) Differences in daily average PM10, and (d) Differences in daily average PM2.5–10.
