Abstract
The course of Alnus spp. pollen seasons was compared in two cities, Lublin and Warsaw, located at a small distance from each other but included in different climatic regions of Poland. The studies were conducted using the volumetric method. It was shown that Alnus pollen seasons started in Warsaw earlier and were much shorter than in Lublin. The span between the start dates of pollen seasons was similar and it was 53-54 days. Peak days occurred in both cities most often in the second decade of March, but in Warsaw they were recorded several days earlier. Maximum concentrations reached higher values in Lublin, whereas annual totals were higher in Warsaw. The number of days with the concentration > 50 pollen grains × m-3 per 24 hours was 5-27 days for Warsaw and 10-19 days for Lublin over 7 years of study.
Keywords
Alnus; pollen seasons; seasonal variations; regional differentiation; threshold concentrations; Lublin; Warszawa; Poland