Alegrete pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Alegrete is low; willow is low; cypress is vhigh.
Pollen Tomorrow
Tomorrow (21 September 2026) willow remains low, cypress increasing.
7-Day Trend
Over the next week cypress will decrease; grass and willow 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) | Vhigh | 77/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | Low | 18/100 |
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) | High | 68/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Low | 7/100 |
Local Environmental Conditions
Alegrete commands the Rio Grande do Sul Campanha grassland plateau near the Uruguayan border as a historic gaucho city, where native pampa grasses, eucalyptus, and riparian gallery forest along the Ibicuí River are the main pollen sources. Grass dominates the pollen season, while the subtropical climate produces a well-defined seasonal progression and the flat, open Campanha landscape allows pollen to disperse very widely throughout.
Alegrete's pollen season follows the region's typical pattern, led by eucalyptus and riparian gallery forest along the Ibicuí River 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 Alegrete right now?
On 20 September 2026, overall pollen levels in Alegrete are very high. Cypress is the main contributor to airborne pollen, while willow remain at lower levels
Will pollen levels change in Alegrete tomorrow?
On 21 September 2026, pollen conditions in Alegrete will be different from today, with willow at low levels and cypress continuing to decline
Is pollen expected to decrease in Alegrete this week?
According to the five-day outlook, cypress pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Alegrete?
On 20 September 2026, Cypress is the dominant pollen source in Alegrete. willow are also present but at lower levels. grass are not currently active.
When is pollen season in Alegrete?
How often is the Alegrete pollen forecast updated?
The Alegrete pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Alegrete 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 Alegrete 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 Alegrete, 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).
