Transport of atmospheric pollutants in a semirural area of Central Italy

An environmental monitoring program aimed to the evaluation of the air quality in the surroundings of Gallese (near Viterbo, in central Italy) was carried out from July 1998 to July 2000. The goal of the program was the comprehension of the transport and transformation mechanisms of nitrogen and sulphur pollutants, and the evaluation of photochemical smog episodes. In this framework, a wide range of atmospheric pollution events was studied, and for many of them it was possible to detect the main source of the pollution. We report in this paper the interpretation of ozone episodes, sulphur dioxide episodes and sea-salts episodes, due to transport from the urban area of Rome, the industrial area of Narni-Tarni and the coastal areas of the Tyrrhenian Sea, respectively.