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Long-term decreases found recently in both the atmospheric electricalpotential gradient (PG) and the air-Earth current density (Jz), usingobservation series from the UK and Hungary, have motivated studies of otherEuropean data. Two surface data series somewhat longer than a decade wereavailable: PG data obtained at Serra do Pilar (Portugal), and PG, Jz andpositive air conductivity measurements at Athens (Greece). Selecting data tominimise local effects, the 1960–1971 Serra do Pilar PG values decrease atdawn and in the evening. Dawn data obtained at Athens (1967–1977) indicate areduction in Jz, while the simultaneous PG values there increase(coincident air conductivity values decrease) for the periods investigated.The Athens PG increase is attributed to local aerosol influences, typical ofurban environments. Despite the urban influence, the Athens Jz showssimilarities with soundings of the ionospheric potential. The decline inJz at Athens occurs simultaneously with a decrease reported previouslyin Jz at Kew (UK), indicating that, at least, a regional decrease in theglobal atmospheric electrical circuit occurred during part of the twentiethcentury. Similar surface changes occur in European atmospheric electricalparameters, with a decrease of about 0.5% to 0.7% per year between1920 and 1970 (possibly extending back to 1898), an annual decrease ofbetween 2.7 and 3.4%, between 1959 and 1971 and a continued decrease ofabout ~1% per year between 1967 and 1984, possibly stillcontinuing. Keywords. Meteorology and atmospheric dynamics (Atmosphericelectricity) – Geomagnetism and paleomagnetism(Time variations, secular and long term) – Atmospheric compositionand structure (Aerosols and particles

Further signatures of long-term changes in atmospheric electrical parameters observed in Europe