| Summary: | In this study an attempt is made to analyse meteorological and air quality observations obtained in the Eordea Basin, Northern Greece, during the period 1991-1993. During this period 118 episode days being characterised by increased SO2 and/or PM10 concentrations were identified. The increased SO2 and PM10 concentrations are mainly due to the power plants operating in the area. These air quality characteristics were interpreted in relation with the local, synoptic, and mesoscale meteorological conditions. The results indicated that the episodedays in this area can be grouped in relation to their synoptic circulation characteristics in five categories. It was found that relatively high concentrations of S2 and high concentrations of PM10 usually are accumulated under moderate to strong northerly winds.
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