AIRBORNE POLLEN AND SPORES OF LEON (SPAIN)

A qualitative and quantitative analysis of airborne pollen and spores was carried out over 2 years (from September 1987 to August 1989) in t he city of Leon. Slides were prepared daily using a volumetric pollen trap, which was placed on the Faculty of Veterinary Science building ( University of Leon) 12 m above ground-level. Fifty-one pollen types we re observed; the most important of these were: Cupressaceae during the winter, Pinus and Quercus in spring, and Poaceae, Leguminosae and Che nopodiaceae in the summer. The results also showed the existence of a rich mould spore assemblage in the atmosphere. The group of Amerospore s (Penicillium, Aspergillus and Cladosporium) as well as Dictyospores (Alternaria) were the most abundant; Puccinia was common in the air in August. Fluctuations in the total pollen and spores m3 of air were co mpared with meteorological parameters (temperature, relative humidity and rainfall). From the daily sampling of the atmosphere of Leon, cons idering the maximum and minimum temperature and duration of rainfall, the start of the pollen grain season was observed generally to coincid e with a rise in temperature in the absence of rain.