PM1 measurements at a site close to an oil/gas pre-treatment plant (Agri Valley - southern Italy): a preliminary study

摘要

A PM_1 (i.e. particulate matter with an aerodynamic diameter less than 1.0 μm) short-term monitoring campaign was carried out in the Agri Valley (southern Italy) in September 2012. This area is of international concern, since it houses one of the largest European on-shore reservoirs and the largest oil/gas pre-treatment plant (i.e. the Centro Olio Val d'Agri - COVA) within an anthropised context. PM_1 measurements were performed in Viggiano, the nearest town to the COVA plant and one of the most populated towns of the Agri Valley. During the study period, the PM_1 daily concentrations ranged from 1.2 to 8.4 μgm~(?3), with a mean value of 4.6 μgm~(?3). Regarding the PM_1 chemical composition, it can be observed that S and typical crustal elements were the most abundant constituents of the PM_1 collected. By applying principal component analysis (PCA), it was pointed out that crustal soil, biomass and wood burning, secondary atmospheric reactions involving COVA plant emissions and local soil particles, and traffic were the main sources contributing to the PM_1 measured in the area under study. Moreover, a possible contribution of the long-range transport of African dust was observed.