Pollen concentration in the atmosphere of Lublin (eastern Poland) was studiedby means of volumetric method using Hirst sampler (VPPS 2000, Lanzoni) in 2001-2002. The pollen trapwas mounted at the height of 15 m in the centre of Lublin. On the basis of analysis of mean daily valuesof pollen concentration, the pollen calendar was constructed for 16 taxa producing the allergenic pollen:Alnus, Corylus, Populus, Ulmus, Fraxinus, Betula, Carpinus, Quercus, Fagus, Pinaceae, Poaceae, Rumex,Plantago, Chenopodiaceae, Artemisia, Urticaceae. Great differences referring to the course of pollenseasons for most of the studied taxa of trees within the 2 years of study were found. They were associatedwith the beginning and end of the pollen season, the amount and the date of maximum pollen concentrationoccurrence, as well as annual sums of pollen grains. Much lower differentiation was observed in the caseof herbaceous plants. This referred mainly to maximum concentration occurrence dates (Urtica, Poaceae)and the length of pollen season (Chenopodiaceae). The most similar course of pollen seasons during 2years was recorded for Artemisia. Among trees, the highest pollen concentrations were recorded for Betula,Pinaceae and Alnus; the lowest for Ulmus, Fagus and Corylus. Very high concentration of herbaceous plant'spollen was observed for Poaceae and Urtica; Plantago and Chenopodiaceae showed the lowest level. Annualsums of pollen grains for Alnus, Populus, Quercus, Betula and Pinaceae were much higher in 2001, butin the case of Ulmus, Fraxinus, Carpinus, Fagus the annual sums of pollen grains in 2002 were almosttwice as high as in 2001. For 5 among 7 herbaceous taxa, annual sums of pollen grains in both years weresimilar.