Rio de Janeiro pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Rio de Janeiro is low; cypress and willow are low.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
7-Day Trend
Over the next week cypress and willow will decrease; grass will remain stable.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | Low | 13/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | Low | 6/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | Low | 13/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Low | 6/100 |
Local Environmental Conditions
Rio de Janeiro's diverse urban vegetation, including Tijuca National Park and the coastal lagoon corridors, features native Atlantic Forest species including ficus and mango alongside introduced trees as the main pollen sources. Exposure varies between these green areas and the densely built hillside and coastal neighbourhoods, while surrounding Atlantic Forest remnants and the Guanabara Bay wetlands contribute substantial year-round pollen under the tropical climate.
Rio de Janeiro's pollen season runs largely year-round in the tropical climate, though tree pollen from native Atlantic Forest species peaks through the drier months from May to September. Grass pollen from urban open spaces contributes throughout the year, while the wet summer season from December to March brings frequent rainfall that periodically suppresses dispersal across the city.
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Frequently Asked Questions About Pollen in Rio de Janeiro
Is pollen high in Rio de Janeiro right now?
On 20 September 2026, overall pollen levels in Rio de Janeiro are low. Willow is the main contributor to airborne pollen, while cypress remain at lower levels
Will pollen levels change in Rio de Janeiro tomorrow?
On 21 September 2026, pollen conditions in Rio de Janeiro will be similar to today, with willow at low levels, cypress at low levels
Is pollen expected to decrease in Rio de Janeiro this week?
According to the five-day outlook, willow and cypress pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Rio de Janeiro?
On 20 September 2026, Willow is the dominant pollen source in Rio de Janeiro. cypress are also present but at lower levels. grass are not currently active.
When is pollen season in Rio de Janeiro?
How often is the Rio de Janeiro pollen forecast updated?
The Rio de Janeiro pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Rio de Janeiro come from nearby or far away?
Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.
Are pollen levels in Rio de Janeiro based on measurements or forecasts?
Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.
Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Rio de Janeiro, modern forecasts combine recent measurements, weather data, and information about local vegetation.
This allows us to estimate pollen levels for today and the coming days, not just report the past.
Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
