Measurement of grass pollen concentration in ambient air
POLAND
The dates of visits to the centers and the periods of assessment of SAR symptoms subjected to statistical analysis were determined based on measurements of grass pollen grain concentrations in ambient air.A Hirst-type apparatus (Lanzoni VPPS 2000) (Concentration of grass pollen grains in the air in eastern Poland in 2021 (red lines indicate the time frame of the pollen season).