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Mean exposure to particulate matter (PM2.5 and PM10) in Italian regions (A) and provinces stratified according to geographical positioning (i.e. North, Centre, South-Islands) (B). ISPRA PM exposure data were not available for Basilicata and Molise regions, whereas public availability was limited to PM10 data for 6 provinces in the Sicilia region. *P < 0.001 for PM10 comparisons with Northern provinces, # p < 0.001 for PM2.5 comparisons with Northern provinces
