Hazel pollen in the air of selected Polish cities in 2022

Hazel is an important source of tree pollen allergens, which are responsible for inhalant allergy symptoms in early spring. The aim the study was to compare Corylus season 2022 12 cities located different regions Poland: Bialystok, Bydgoszcz, Cracow, Kielce, Lublin, Olsztyn, Piotrkow Trybunalski, Sosnowiec, Szczecin, Warsaw, Wroclaw and Zielona Gora. measurements were conducted using a Burkard- type volumetric sampler, operating continuous mode. following parameters analyzed: duration, peak value date, seasonal integral number days with concentration exceeding threshold values triggering sensitized individuals. hazel began January first decade February. earliest it western regions, latest eastern Poland. In most cities, maximum daily concentrations registered between February 5th 24th. season, compared 2021 characterized by higher concentrations, integrals (SPI) analyzed cities. highest recorded Lublin (290 grains/m3) annual sum Cracow (2071). risk allergens individuals found Kielce Sosnowiec.