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The paper presents the results of the research on the pollen seasons of hazel ( Corylus ), alder ( Alnus ) and birch ( Betula ) in 2014 and 2016. The samples were collected gravimetrically at weekly intervals. The deposition values were converted into the pollen grains concentration in 1 m 3 of air. The analysis of the pollen seasons was conducted based on the properties of the seasons: beginning, end, season duration, annual totals of pollen and maximum concentrations. The courses of the both compared pollen seasons differed. In 2014, the tree pollen season began two weeks later than in 2016, a year that was marked by high annual totals of pollen counts and maximum pollen concentrations of alder and birch. Only hazel showed higher values in 2014.

The analysis of the Corylus, Alnus and Betula pollen seasons in Toruń in 2014 and 2016