PM2.5win chemical composition.

Table summarizing mean chemical composition (µg/µg PM) of 4 PM2.5win pooled samples (modified by Perrone et al. [12]). Inorganic ions explained about the 50% of the PM mass, the sum of all elements explained about the 0.6% while the contribution of PAHs was 0.019%. BaA: benzo[a]anthracene; BeP: benzo[e]pyrene; Bb+jF: benzo[b+j]fluoranthene; BkF: benzo(k)fluoranthene; BaP: benzo[a]pyrene; dBahA: dibenzo[a,h]anthracene; BghiP: benzo[g,h,i]perylene; IcdP: indeno[1,2-Cd]pyrene.Concerning sources, traffic and heating during cold season constitute the 49–53% of the primary combustion sources of fine PM; during warm season they constitute about the 25%, while secondary sources are predominant (50–66%) [20]. Elemental carbon (primarily from traffic) contributes for about 10–15% to the fine fraction; organic matter, calculated applying a specific organic matter-to-organic carbon conversion factor to each source, contributes for 31–38% to the fine fraction [20].PM2.5win chemical composition.