Pollen and allergies — Ljubljana
Ljubljana lies in the Ljubljana Basin, surrounded by forested foothills (Rožnik, Golovec) on one side and the wet plains of Ljubljana Marshes on the other. A continental climate with cold winters and warm summers favors a diverse pollen season — from early spring flowering of alder and hazel to summer grasses and autumn ragweed.
Main allergens and season
- Late winter and spring (February–May): alder along watercourses and hazel in wet, shaded shelters, then birch from surrounding forests — often the main spring allergen in the basin.
- Late spring and summer (May–July): grasses from the Marshes meadows and foothills.
- Late summer and autumn (August–September): ragweed, rarer than in Slovenian Prekmurje but present around construction sites and cultivated surfaces.
Ljubljana does not have its own measuring station on this service, so the displayed forecast is based on a European CAMS model (via Open-Meteo) — the values are modeled, not measured, but a useful guide for planning outdoor activities.