On the contrary, the study of the emission variability showed
valuable results for the characterization of rural regime in terms of
best siting of new monitoring stations or preliminary analyses of
spatial representativeness of rural background selected sites. As
case studies, the sites of Schivenoglia, (located in Northern Italy, in
the Po Valley inland) and Ripatransone (located in Central Italy,
near the Adriatic coastline) were chosen. Both these stations are
designed for measuring all the pollutants under concern (Particulate
Matter, PAHs and heavy metals) and both of them are actually
located in rural background areas, far from urbanized areas. The
most important emission sources in the neighbourhood of the two
sites are respectively some industrial plants and a highway for
Schivenoglia site, and the Adriatic highway for Ripatransone site. In
Figs. 4 and 5 emission gridded data and their classified variability
are shown for PM2.5, PAHs and Arsenic, being these pollutants
chosen consistently with Fig. 2. Data are shown in a neighbourhood
of almost 50 km around the stations and information on mainemission sources locations are integrated to help the interpretation
of results.