Tarrasa pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Tarrasa 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 | 66/100 |
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
Tarrasa' parks and the Llobregat River tributary corridor feature oak, pine, and plane as the main tree pollen sources, with exposure varying between green areas and the more built-up city centre. Surrounding Catalan pre-coastal farmland and the Sant Llorenç del Munt massif contribute substantial tree and grass pollen, while the sub-Mediterranean climate and limited summer rainfall concentrate pollen dispersal during spring.
Tarrasa' pollen season runs from February through June, opening with pine and plane tree pollen in late winter before grass pollen from surrounding Catalan pre-coastal farmland peaks through April and May. The sub-Mediterranean climate means fewer rainfall interruptions than in Atlantic-facing Spanish cities, while the Sant Llorenç del Munt massif and the Llobregat valley channel airflows and concentrate pollen during the spring peak period.
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Frequently Asked Questions About Pollen in Catalonia
Is pollen high in Tarrasa right now?
On 20 September 2026, overall pollen levels in Tarrasa are high. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Tarrasa tomorrow?
On 21 September 2026, pollen conditions in Tarrasa will be similar to today, with artemisia at high levels
Is pollen expected to decrease in Tarrasa 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 Tarrasa?
On 20 September 2026, Artemisia is the dominant pollen source in Tarrasa. grass, willow, and cypress are not currently active.
When is pollen season in Tarrasa?
How often is the Tarrasa pollen forecast updated?
The Tarrasa pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Tarrasa 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 Tarrasa 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 Tarrasa, 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).
