Vectorial model to study the local breeze regimen and its relationship with SO2 and particulate matter concentrations in the urban area of Castellón, Spain

A study of SO2 and particulate matter pollution in the urban area of Castellón (Spain) and its relationship to meteorological parameters — wind direction, intensity and temperature, has been carried out. The topographic characteristics of the area under study influence local breezes. The study of the local breezes regime has been carried out using a vectorial model. The determination of meteorological parameters has been of great importance in examining the relationship with the concentration of SO2 and particulate matter. A decrease in particulate matter and SO2 pollution has been noted during the winter months as a result of stronger winds. An increase was noted when the wind direction was between 180° and 270° during the winter period and between 135° and 270° during the summer months, at all the stations where samples were taken. On the other hand, during the winter when temperatures rise, a decrease in the concentration of SO2 and particulate matter can be seen, whereas no such correlation can be seen for the summer months. The existence of a seasonal cycle was noted, more obviously in the case for particulate matter than for SO2 pollution. This could be due to the characteristic sea breezes which operate in this area.