Fifteen years of regular smoke measurements in greater Athens Area, Greece

Daily smoke concentrations obtained by the Athens air pollution monitoring network for a fifteen-year period started in 1984 were analysed. The analys is showed decreasing trends at all monitoring stations during this period. The seasonal variation of smoke concentrations presents a maximum during th e cold period of the year and a minimum during the warm period. Maximum smo ke concentrations are observed at central-city residential stations (downto wn Athens and Piraeus) during the cold period of the year, while at station s located in industrial areas the seasonal variation has a very small ampli tude.