Grajaú pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Grajaú is moderate; willow is moderate; cypress is low.
Pollen Tomorrow
Tomorrow (21 September 2026) willow remains moderate, cypress increasing.
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) | Low | 20/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | Moderate | 29/100 |
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 | 28/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Moderate | 31/100 |
Local Environmental Conditions
Grajaú commands the southern Maranhão cerrado-caatinga transitional zone as a remote interior municipality, where native cerrado trees, babaçu palm, and caatinga scrub are the main pollen sources. The wet season from October to April brings frequent rainfall interruptions, while the dry season concentrates pollen dispersal and the transitional zone contributes a distinctive mixed pollen environment throughout.
In Grajaú, babaçu palm and caatinga scrub pollen disperses continuously through the year with no distinct seasonal boundary, though the wet season from October to April regularly interrupts counts with frequent rainfall.
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Frequently Asked Questions About Pollen in Maranhão
Is pollen high in Grajaú right now?
On 20 September 2026, overall pollen levels in Grajaú are moderate. Willow is the main contributor to airborne pollen, while cypress remain at lower levels
Will pollen levels change in Grajaú tomorrow?
On 21 September 2026, pollen conditions in Grajaú will be different from today, with willow at moderate levels and cypress increasing
Is pollen expected to decrease in Grajaú this week?
According to the five-day outlook, willow and cypress pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Grajaú?
On 20 September 2026, Willow is the dominant pollen source in Grajaú. cypress are also present but at lower levels. grass are not currently active.
When is pollen season in Grajaú?
How often is the Grajaú pollen forecast updated?
The Grajaú pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Grajaú 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 Grajaú 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 Grajaú, 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).
