São Leopoldo pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in São Leopoldo is moderate; cypress and willow are moderate; grass is low.
Pollen Tomorrow
Tomorrow (21 September 2026) cypress no longer expected, grass no longer expected, willow no longer expected.
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 | 48/100 |
| Grass (Poaceae) | Low | 17/100 |
| Willow (Salicaceae) | Moderate | 32/100 |
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) | None | 0/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 |
Local Environmental Conditions
São Leopoldo forms part of the Rio Grande do Sul northern metropolitan footwear industry zone along the Sinos River, where eucalyptus, native Atlantic Forest remnants, and introduced urban trees are the main pollen sources. The subtropical climate produces a well-defined pollen season, while the Sinos valley concentrates pollen under calm conditions and rainfall interruptions occur throughout the year in this important Rio Grande do Sul footwear city.
São Leopoldo's pollen season follows the region's typical pattern, led by eucalyptus and native Atlantic Forest remnants 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 São Leopoldo right now?
On 20 September 2026, overall pollen levels in São Leopoldo are moderate. Cypress is the main contributor to airborne pollen, while willow and grass remain at lower levels
Will pollen levels change in São Leopoldo tomorrow?
On 21 September 2026, pollen conditions in São Leopoldo will be similar to today with no significant pollen expected.
Is pollen expected to decrease in São Leopoldo 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 São Leopoldo?
On 20 September 2026, Cypress is the dominant pollen source in São Leopoldo. willow and grass are also present but at lower levels.
When is pollen season in São Leopoldo?
How often is the São Leopoldo pollen forecast updated?
The São Leopoldo pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in São Leopoldo 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 São Leopoldo 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 São Leopoldo, 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).
