ACTA AGROBOTANICA

A b s t r a c t Grass pollen allergens are a frequent cause of pollen aller-gy in Poland and other European countries. The research on aero-plankton conducted in Lublin since 2001 allows characterization of the course of grass pollen seasons and estimation of the effect of maximum and minimum temperatures, relative air humidity, precipitation and maximum wind velocity on the taxon’s pollen concentration. The gravimetric method was used in the study. During the eight-year research period, the pollen season usually started in the first or second decade of May and, as a rule, it lasted till the end of August, and quite exceptionally, in 2002 and 2008 till mid-August. The mean length of the pollen season was 107 days. The highest grass pollen risk was observed in the 26th and 27th week. The highest annual counts reaching over 3600 pollen grains cm-2 were noted in 2008, while in the other study years they ranged from 741 to 1909. The date of the pollen season on-set and its course were highly dependent on weather conditions, which was confirmed by the statistical analysis. The greatest sig-nificant influence on the pollen season was exerted by maximum temperature, relative air humidity and the maximum wind