Pollen Count & Forecast for Rio de Janeiro

Rio’s dry winter (June-August) is dominated by Grass and Casuarina pollen; Grass (Poaceae) is prolific in Quinta da Boa Vista and Aterro do Flamengo; Casuarina (Casuarina equisetifolia) is widespread along Copacabana and Ipanema beaches. Cypress (Cupressus) contributes significantly from the Jardim Botânico. Spring (September-November) sees high Eucalyptus (Eucalyptus) pollen levels, originating from the Tijuca Forest and along Morro da Urca slopes.

Steep hills and the Tijuca Massif trap humid air, leading to localised high humidity. Year-round moisture near the Rodrigo de Freitas Lagoon and Guanabara Bay increases Mould (Aspergillus, Penicillium) spore counts, from tropical forest soils and damp urban environments.