Guarulhos pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Guarulhos is low; cypress and willow are 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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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) | Low | 17/100 |
| Grass (Poaceae) | None | 0/100 |
| 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) | Low | 17/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Low | 11/100 |
Local Environmental Conditions
Guarulhos' urban green spaces, anchored by Parque Estadual da Cantareira fringe and the Baquirivu-Guaçu River corridor, feature eucalyptus, pine, and native Atlantic Forest species as the main tree pollen sources, with exposure varying between these green areas and the densely built metropolitan centre. Surrounding São Paulo metropolitan woodland and farmland contribute substantial grass and tree pollen, with the tropical climate supporting year-round pollen production.
Guarulhos' pollen season is most pronounced during the dry season from May to September, when eucalyptus, pine, and native Atlantic Forest species release pollen and grass exposure increases across the city. The tropical highland climate means frequent rainfall during the wet summer from November to March suppresses dispersal, while the dry season concentrates pollen production and dispersal across the São Paulo metropolitan area.
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Frequently Asked Questions About Pollen in São Paulo
Is pollen high in Guarulhos right now?
On 20 September 2026, overall pollen levels in Guarulhos are low. Cypress is the main contributor to airborne pollen, while willow remain at lower levels
Will pollen levels change in Guarulhos tomorrow?
On 21 September 2026, pollen conditions in Guarulhos will be similar to today, with cypress at low levels, willow at low levels
Is pollen expected to decrease in Guarulhos 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 Guarulhos?
On 20 September 2026, Cypress is the dominant pollen source in Guarulhos. willow are also present but at lower levels. grass are not currently active.
When is pollen season in Guarulhos?
How often is the Guarulhos pollen forecast updated?
The Guarulhos pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Guarulhos 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 Guarulhos 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 Guarulhos, 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).
