Pollen and allergies — Perugia
Perugia rises on a hilltop at about 500 metres, set in Umbria between the Apennine ridges, the Tiber valley and Lake Trasimeno not far away. Winters are colder than on the coast, and temperature inversions in the valley floors can trap air and pollen, while on the Umbrian hills the olive groves enjoy a sheltered, mild microclimate. The landscape alternates woodland, meadows and farmland in a mosaic that changes quickly with altitude.
Periods and allergens to watch
- Spring: alder and birch can open the season in tree stands and Apennine woodland.
- Spring and summer: grasses in meadows, pastures and along the valleys that surround the hill.
- May and June: olive flowering across the Umbrian groves, from the Perugia district toward Assisi and the Martani hills.
- Late summer: mugwort in margins and uncultivated ground; ragweed, less widespread in Umbria than in the Po Valley, still appears in the modeled data.
Perugia uses CAMS through Open-Meteo. Concentrations are modeled, not measured locally by this service, at approximately 11 km resolution. The forecast displays alder, birch, grasses, mugwort, olive and ragweed; it does not automatically cover cypress or parietaria, both present in the Umbrian landscape, or every regional species.
Altitude and the shape of the land matter: in the valley floors, under temperature inversions, pollen can concentrate in the evening and early morning, while on the ridges the ventilation disperses it. A stroll in the Etruscan centre or out toward Lake Trasimeno may not match the hilltop reading. Treat the model as a guide for the area and check real conditions before spending a long time outdoors.