Osasco pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Osasco 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 | 26/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | Low | 8/100 |
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 | 26/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Low | 8/100 |
Local Environmental Conditions
Osasco's urban setting features eucalyptus, pine, and introduced trees as the main pollen sources, with exposure varying between green areas and the densely built city centre. Surrounding São Paulo metropolitan woodland and the Tietê River corridor contribute additional tree and grass pollen, with the tropical highland climate supporting extended pollen production throughout the year.
Osasco's pollen season is most pronounced during the dry season from May to September, when eucalyptus, pine, and introduced trees release pollen and grass exposure increases across the city. The tropical highland climate means frequent rainfall during the wet summer suppresses dispersal, while the dry season concentrates pollen production across the western São Paulo metropolitan area throughout the season.
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Frequently Asked Questions About Pollen in São Paulo
Is pollen high in Osasco right now?
On 20 September 2026, overall pollen levels in Osasco are moderate. Cypress is the main contributor to airborne pollen, while willow remain at lower levels
Will pollen levels change in Osasco tomorrow?
On 21 September 2026, pollen conditions in Osasco will be similar to today, with cypress at moderate levels, willow at low levels
Is pollen expected to decrease in Osasco 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 Osasco?
On 20 September 2026, Cypress is the dominant pollen source in Osasco. willow are also present but at lower levels. grass are not currently active.
When is pollen season in Osasco?
How often is the Osasco pollen forecast updated?
The Osasco pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Osasco 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 Osasco 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 Osasco, 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).
