Study on ambient concentrations of PM_(10), PM _(10-2.5), PM_(2.5) and gaseous pollutants. Trace elements and chemical speciation of atmospheric particulates

摘要

This study provides the first comprehensive report on mass concentrations of particulate matter of various sizes, inorganic and organic gas concentrations monitored at three sampling sites in the city of Palermo (Sicily, Italy). It also provides information on the water-soluble species and trace elements. A total of 2054 PM_(10) (1333) and PM_(2.5) (721) daily measurements were collected from November 2006 to February 2008. The highest mass concentrations were observed at the urban stations, average values being about two times higher than those at the suburban (control) site. Time variations in PM_(10) and also PM_(10-2.5) were observed at the urban stations, the highest concentrations being measured in autumn and winter. CO, NOx, NO_2, benzene, toluene and o-xylene concentrations peaked in autumn and winter, a pattern similar to those recorded for PM_(10) and PM_(10-2.5) mass levels, indicating the importance of traffic emissions in urban air pollution. 91% and 51% of the benzene measurements exceeded the limit of 5 μg m~(x-3) at the two urban monitoring sites. Trace elements (As, Ba, Cr, Cu, Mo, Pb, Sb) suspected of being introduced into the atmosphere mainly by anthropogenic activities, were highly enriched with respect to local soil. Results indicate that a large fraction of PM10 (31-47% in weight) and PM_(2.5) (29% in weight) is made up of water-soluble ions. Ammonium sulphate and nitrate particles accounted for 14-29 wt% of particulate matter mass concentrations. Crustal and marine components, combined, account for 41% and 49% in PM_(2.5) and PM_(10), respectively. The calculated deficits in Cl~- and NH-4~+ ions suggest that a proportion of these ions are lost, via the formation of gaseous NH_4CI or HC1 and NH_3.