Barra Mansa pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Barra Mansa is moderate; willow is moderate; cypress is vhigh.
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) | Vhigh | 87/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | Moderate | 30/100 |
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) | Vhigh | 87/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Moderate | 30/100 |
Local Environmental Conditions
Barra Mansa occupies the Rio de Janeiro Paraíba do Sul valley industrial region where the river bends through the Serra, where native Atlantic Forest remnants, eucalyptus, and the Paraíba do Sul River corridor vegetation are the main pollen sources. The tropical climate supports year-round pollen production, while the wet summer months bring the most frequent rainfall interruptions and the enclosed valley concentrates pollen under calm conditions throughout.
In Barra Mansa, pollen exposure builds through the drier months as where native Atlantic Forest remnants and eucalyptus pollen spreads freely, while the wet season regularly interrupts dispersal with rainfall.
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Frequently Asked Questions About Pollen in Rio de Janeiro
Is pollen high in Barra Mansa right now?
On 20 September 2026, overall pollen levels in Barra Mansa are very high. Cypress is the main contributor to airborne pollen, while willow remain at lower levels
Will pollen levels change in Barra Mansa tomorrow?
On 21 September 2026, pollen conditions in Barra Mansa will be similar to today, with cypress at very high levels, willow at moderate levels
Is pollen expected to decrease in Barra Mansa 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 Barra Mansa?
On 20 September 2026, Cypress is the dominant pollen source in Barra Mansa. willow are also present but at lower levels. grass are not currently active.
When is pollen season in Barra Mansa?
How often is the Barra Mansa pollen forecast updated?
The Barra Mansa pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Barra Mansa 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 Barra Mansa 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 Barra Mansa, 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).
