Pollen Count & Forecast for Ljubljana

Ljubljana’s spring allergy season (March-May) is dominated by Birch (Betula) and Hazel (Corylus avellana) pollen; Birch is common on Rožnik Hill and Castle Hill; Hazel lines the Ljubljanica River banks. Beech (Fagus sylvatica) and Oak (Quercus) are common in Golovec Hill forests. Summer (June-August) has high Grass (Poaceae) levels from Tivoli Park and southern marshes; late summer sees Ragweed (Ambrosia artemisiifolia) along roadsides and fields.

The city sits in a basin; temperature inversions trap pollen and urban pollutants near the ground. Autumn and winter see high Mould (Alternaria, Cladosporium) counts; spores come from wet leaf litter in Tivoli Park and damp conditions along the river.