Rio das Ostras pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Rio das Ostras is moderate; cypress is moderate; willow is 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) | Moderate | 30/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | Low | 9/100 |
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) | Moderate | 30/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Low | 9/100 |
Local Environmental Conditions
Rio das Ostras lies on the Rio de Janeiro northern Atlantic coast in the oil industry zone near Macaé, where restinga coastal scrub, native Atlantic Forest remnants, and introduced urban resort trees are the main pollen sources. The tropical climate supports year-round pollen production, while the coastal position means onshore Atlantic breezes can periodically disperse pollen and the wet summer months bring the most frequent rainfall interruptions throughout this growing Rio de Janeiro oil coast resort municipality.
The dry season brings Rio das Ostras's heaviest pollen exposure, led by restinga coastal scrub and introduced urban resort trees pollen, before the wet season restores more frequent rainfall interruptions.
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Frequently Asked Questions About Pollen in Rio de Janeiro
Is pollen high in Rio das Ostras right now?
On 20 September 2026, overall pollen levels in Rio das Ostras are moderate. Cypress is the main contributor to airborne pollen, while willow remain at lower levels
Will pollen levels change in Rio das Ostras tomorrow?
On 21 September 2026, pollen conditions in Rio das Ostras will be similar to today, with cypress at moderate levels, willow at low levels
Is pollen expected to decrease in Rio das Ostras 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 Rio das Ostras?
On 20 September 2026, Cypress is the dominant pollen source in Rio das Ostras. willow are also present but at lower levels. grass are not currently active.
When is pollen season in Rio das Ostras?
How often is the Rio das Ostras pollen forecast updated?
The Rio das Ostras pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Rio das Ostras 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 das Ostras 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 das Ostras, 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. |
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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).
