Três Rios Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (11 October) pollen in Três Rios is moderate; cypress is moderate; willow is low.
Pollen Tomorrow
Tomorrow (12 October 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 - 11 October
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | Moderate | 47/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | Low | 20/100 |
Tomorrow - 12 October
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | Moderate | 37/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Low | 19/100 |
Local Environmental Conditions
Built-up land makes up around 50% of the area near the center of Três Rios, with some woodland and open grassland. Close to running water, riverside vegetation contributes to what is in the air. Locally, the woodland makes trees an important source; open grassland adds grass and weed pollen; street trees, parks and lawns are the main sources in the built-up parts.
Flowering trees bring the first pollen of the year in early spring. Grass pollen follows, peaking in mid-spring and easing off by mid-fall. A smaller weed peak follows from early summer into early fall. Mold spores join in from late spring into midwinter, when damp, warm spells let them thrive.
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Frequently Asked Questions About Pollen in Rio de Janeiro
Is pollen high in Três Rios right now?
On 11 October 2026, overall pollen levels in Três Rios are moderate. Cypress is the main contributor to airborne pollen, while willow remain at lower levels
Will pollen levels change in Três Rios tomorrow?
On 12 October 2026, pollen conditions in Três Rios will be similar to today, with willow at low levels, cypress at moderate levels
Is pollen expected to decrease in Três Rios 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 Três Rios?
On 11 October 2026, Cypress is the dominant pollen source in Três Rios. willow are also present but at lower levels. grass are not currently active.
When is pollen season in Três Rios?
How often is the Três Rios pollen forecast updated?
The Três Rios pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Três Rios 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 Três Rios 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 Três Rios, 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 pollen scores represent risk levels, not direct pollen measurements. Higher scores indicate higher risk.
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).
