IMPACT OF VEHICULAR AND MARITIME TRANSPORT EMISSIONS ON THE AIR QUALITY OF A COASTAL CITY

This study focuses on the measurement of the size distributions and the chemical composition of atmospheric fine aerosol particles measured in the proximity of the Napoli harbor. In particular, this study focuses on source apportionment for particles in the atmosphere of a costal urban area in order to correlate particle concentration levels with meteorological conditions, vehicle emissions and port activities. Measurements have been performed along a 6 month period from March to June 2016. The analysis of the size distributions and the chemical characteristics of the collected particles shows that fine particulate matter (PM) of natural origin (sea salt aerosol) contributes significantly to the concentration of PM detected in the harbor. There is a contribution of PM of anthropogenic origin in conditions of high vehicular and naval traffic and under certain environmental conditions. PM concentration changes during the daytime: decreasing at nighttime and rising at peak hours of morning and evening traffic events (both maritime and vehicular). Sulfur is present in the collected particles despite of a limitation to the use of sulphur-containing fuels for the ships is prescribed by the Port Authority. Hence, other terrestrial activities in the harbor area make use of sulphur-containing fuels thus contributing to the increase of the secondary organic aerosol formation.