Pollen Count & Forecast for Rome

Rome’s spring season (February–May) is dominated by Pellitory (Parietaria judaica) and Cypress (Cupressus sempervirens) pollen; Pellitory common on ancient stone walls and Tiber riverbanks; Cypress frequent on the Janiculum Hill. Olive (Olea europaea) contributes from the Castelli Romani hills. Summer (May–July) sees high Grass (Poaceae) pollen levels, originating from meadows in Villa Ada and Villa Borghese.

The city’s seven hills and narrow streets trap pollen, leading to high concentrations in low-lying areas. Autumn and winter see elevated Mould (Alternaria, Cladosporium) spore counts, from damp leaf litter on the Pincian Hill and along the Tiber riverbanks.