Niterói pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Niterói 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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Features and forecast availability vary by region.
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 | 22/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | Low | 23/100 |
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 | 22/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Low | 24/100 |
Local Environmental Conditions
Niterói's coastal setting features native Atlantic Forest species including ficus and mango as the main tree pollen sources, with exposure varying between green areas and the more built-up city centre. Surrounding Guanabara Bay wetlands and Atlantic Forest fragments contribute additional pollen, while onshore winds from the bay can periodically disperse urban pollen.
Niterói's pollen season runs largely year-round in the tropical coastal climate. Tree pollen from native Atlantic Forest species peaks through the drier months from May to September, while grass pollen from urban open spaces contributes throughout the year. The wet summer season from December to March brings frequent rainfall that periodically suppresses dispersal, while onshore winds from Guanabara Bay can periodically moderate pollen levels.
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Frequently Asked Questions About Pollen in Rio de Janeiro
Is pollen high in Niterói right now?
On 20 September 2026, overall pollen levels in Niterói are low. Cypress is the main contributor to airborne pollen, while willow remain at lower levels
Will pollen levels change in Niterói tomorrow?
On 21 September 2026, pollen conditions in Niterói will be similar to today, with cypress at low levels, willow at low levels
Is pollen expected to decrease in Niterói this week?
According to the five-day outlook, cypress and willow pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Niterói?
On 20 September 2026, Cypress is the dominant pollen source in Niterói. willow are also present but at lower levels. grass are not currently active.
When is pollen season in Niterói?
How often is the Niterói pollen forecast updated?
The Niterói pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Niterói 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 Niterói 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 Niterói, 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).
