Pollen Count & Forecast for Nantes
About Pollen in Nantes
Nantes’ spring allergy season (March-May) is dominated by Birch and Ash pollen; Birch (Betula) common in the Jardin des Plantes and Parc de Procé; Ash (Fraxinus) frequent along the Erdre riverbanks. Oak (Quercus) contributes significantly from the Forêt de Touffou. Summer (May-August) sees high Grass (Poaceae) pollen levels, originating from the Loire riverbanks and Parc du Grand-Blottereau.
The city’s low elevation and river confluence trap humid air, leading to localised high concentrations. Autumn and winter see elevated Mould (Alternaria, Cladosporium) spore counts, from decomposing leaf litter in the Petite Amazonie marsh and damp parklands.
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What Pollen Levels Mean
LOW
Symptoms are unlikely
MED
Moderate risk of symptoms
HIGH
Widespread symptoms likely
V.HI
Expect significant symptoms
X.HI
Extremely high symptom likelihood & severity