Pollen and allergies — Zagreb

Zagreb lies in the basin of the Sava river, at the foot of Medvednica, and combines dense urban construction with large parks, tree-lined avenues, and green slopes. This landscape means that allergy sufferers experience several waves of pollen through the season — from spring trees in parks and avenues to summer grasses on lawns and abandoned surfaces.

Main allergens and season

  • Spring (March–May): birch, ash, and other tree pollen from parks and tree-lined avenues; in Zagreb, birches are common as ornamental trees and can produce pronounced peaks, and ash is common in the floodplain forests along the Sava.
  • Late spring and summer (May–July): grasses are the most widespread allergen on Zagreb's lawns, meadows along the Sava, and neglected parcels.
  • Late summer and autumn (August–September): ragweed, which thrives along railroad tracks, construction sites, and abandoned urban land in continental Croatia.

Weather strongly affects exposure: windy and dry days raise pollen concentration in the air, while rain temporarily "washes out" pollen. Therefore, risk assessment is calculated from a combination of pollen and weather forecast.

Further reading