Characterization of PM2.5 and its oxidative potential in three areas of Southern Italy

Le résumé fourni par la source

The study of the atmospheric particulate matter (PM) oxidative potential (OP), a general indicator of human health risks associated with PM exposure, has become a focal point in research. In Italy, the number of studies concerning OP is limited, especially for the fine fraction of PM. This study aims to compare the impact of different natural and anthropogenic sources on fine PM (PM 2.5 ) and its OP on three areas of Southern Italy. A study of PM 2.5 sources sampled at a rural site was carried out. The PM 2.5 sources were identified and characterized with the Positive Matrix Factorization (PMF5.0) model, while the contribution of each source to the OP estimated with the multi-linear regression (MLR) analysis. Results were compared with those obtained from two similar studies, related to different typology sites in south Italy. The PMF5.0 identified similar sources for the three sites, with different contributions to PM 2.5 and OP. The MLR analysis highlights that combustion sources are the main contributors to the OP activity of PM 2.5 . The relative contributions to OP and PM 2.5 are not comparable for all sources. Results of this study represent a contribution to a better understanding of the potential health impact caused by PM 2.5 ; of its spatial variability; and role of different sources. • PM 2.5 , its sources and oxidative potential (OP) studied in rural/suburban areas. • OP in the rural area was higher than suburban areas values. • OP correlated with combustion sources and photochemical processes species. • Source apportionment found same sources but different contributions to PM and OP. • Combustion sources identified as highest contributors to OP for all areas.

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