Santa Rosa pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Santa Rosa is moderate; cypress and grass are moderate; willow is low.
Pollen Tomorrow
Tomorrow (21 September 2026) cypress remains moderate, willow remains low, grass declining.
7-Day Trend
Over the next week cypress, grass, and willow will increase.
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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) | Moderate | 26/100 |
| Willow (Salicaceae) | Low | 11/100 |
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 | 29/100 | |
| Grass (Poaceae) | Low | 1/100 | |
| Willow (Salicaceae) | Low | 2/100 |
Local Environmental Conditions
Santa Rosa commands the Rio Grande do Sul northwestern highlands near the Argentine border, where native Araucaria forest remnants, eucalyptus, and soybean farmland are the main pollen sources. The subtropical highland climate produces a well-defined pollen season, while the elevated plateau setting creates a more defined seasonal progression and rainfall interruptions occur throughout the year throughout this important Rio Grande do Sul western highland agribusiness city.
Santa Rosa's pollen season follows the region's typical pattern, led by native Araucaria forest remnants and soybean farmland pollen, with exposure varying across the year according to local seasonal rainfall and temperature patterns.
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Frequently Asked Questions About Pollen in Rio Grande do Sul
Is pollen high in Santa Rosa right now?
On 20 September 2026, overall pollen levels in Santa Rosa are moderate. Cypress is the main contributor to airborne pollen, while grass and willow remain at lower levels
Will pollen levels change in Santa Rosa tomorrow?
On 21 September 2026, pollen conditions in Santa Rosa will be different from today, with cypress at moderate levels, willow at low levels and grass continuing to decline
Is pollen expected to decrease in Santa Rosa this week?
According to the five-day outlook, cypress, grass, and willow pollen levels will increase later in the week.
Which pollen types are currently active in Santa Rosa?
On 20 September 2026, Cypress is the dominant pollen source in Santa Rosa. grass and willow are also present but at lower levels.
When is pollen season in Santa Rosa?
How often is the Santa Rosa pollen forecast updated?
The Santa Rosa pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Santa Rosa 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 Santa Rosa 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 Santa Rosa, 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).
