Pollen Count & Forecast for Grenoble

Grenoble’s spring allergy season (March-May) sees high levels of Birch (Betula) and Plane (Platanus x acerifolia) pollen; Birch present in city parks like Parc Paul Mistral and surrounding forests; Plane common along city streets. Oak (Quercus) and Ash (Fraxinus) contribute from the foothills of the Chartreuse and Vercors mountains. Summer (May-July) has elevated Grass (Poaceae) pollen counts, originating from riverbanks of the Isère and Drac, and Parc de l’Ile d’Amour.

The city’s deep valley setting, surrounded by mountains, can trap airborne pollen, leading to concentrated levels. High humidity near the Isère and Drac rivers also affects local conditions. Autumn and winter experience elevated Mould (Alternaria, Cladosporium) spore counts, from decomposing leaf litter in parklands and damp city structures.