Pollen Count & Forecast for Hanoi

Hanoi’s dry season (November-April) is dominated by Acacia and Pine pollen; Acacia (Acacia confusa) prolific near West Lake and Ba Vi National Park; Pine (Pinus) widespread across northern hilly regions. Eucalyptus (Eucalyptus camaldulensis) contributes significantly from plantations around the city. The wet season (May-October) sees high Grass (Poaceae) pollen levels, originating from the Red River banks and Thue Le Park.

Narrow street grids and dense architecture in the Old Quarter trap allergens; proximity to Hoan Kiem Lake increases localized moisture. The monsoon season sees elevated Mould (Aspergillus, Penicillium) spore counts, from damp building interiors and wet leaf litter in city parks.