Granollers pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Granollers is high; mugwort is high.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
7-Day Trend
Over the next week mugwort will decrease; cypress, 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) | None | 0/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | High | 70/100 |
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 | |
| Mugwort (Artemisia) | High | 70/100 |
Local Environmental Conditions
Granollers' Congost and Besòs river corridors and surrounding suburban green spaces feature oak, pine, and plane as the main tree pollen sources. The Montseny massif to the north is a particularly significant regional tree pollen source, while surrounding Catalan pre-coastal farmland contributes grass pollen and the Vallès Oriental valley channels airflows under prevailing northerly winds throughout.
Granollers' Vallès Oriental valley channels airflows during the sub-Mediterranean season opening in January with hazel, olive, and cypress before plane and oak peak through March and April. Cypress contributes from January through spring. Grass from surrounding Catalan farmland peaks through May and June, while mugwort and nettle extend exposure into September and the relatively dry climate means fewer rainfall interruptions than in Atlantic-facing Spain.
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Frequently Asked Questions About Pollen in Catalonia
Is pollen high in Granollers right now?
On 20 September 2026, overall pollen levels in Granollers are high. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Granollers tomorrow?
On 21 September 2026, pollen conditions in Granollers will be similar to today, with artemisia at high levels
Is pollen expected to decrease in Granollers this week?
According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Granollers?
On 20 September 2026, Artemisia is the dominant pollen source in Granollers. cypress, grass, and willow are not currently active.
When is pollen season in Granollers?
How often is the Granollers pollen forecast updated?
The Granollers pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Granollers 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 Granollers 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 Granollers, 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).
