Geraardsbergen pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Geraardsbergen is moderate; mugwort is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort declining.
7-Day Trend
Over the next week mugwort will increase; cypress, grass, and willow 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) | None | 0/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Moderate | 27/100 |
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) | Low | 21/100 |
Local Environmental Conditions
The vegetation around Geraardsbergen, on the Dender river plain in East Flanders, is led by birch and oak among tree species, with grass adding to seasonal totals from the surrounding Oost-Vlaanderen land. Streets close to open ground typically see a different mix than the denser centre, particularly once the main tree pollen peak has eased off.
Geraardsbergen's pollen year begins with alder and willow in late winter, builds to a birch and oak peak through spring, and tapers as grass fades with the first summer heat; the window spans the January-to-August window. ragweed adds a modest late-season tail in areas near farmland. Being on the Dender river plain in East Flanders, Geraardsbergen sees exposure ease once the season's main drivers pass.
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Frequently Asked Questions About Pollen in Oost-Vlaanderen
Is pollen high in Geraardsbergen right now?
On 20 September 2026, overall pollen levels in Geraardsbergen are moderate. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Geraardsbergen tomorrow?
On 21 September 2026, pollen conditions in Geraardsbergen will be different from today, with artemisia continuing to decline
Is pollen expected to decrease in Geraardsbergen this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Geraardsbergen?
On 20 September 2026, Artemisia is the dominant pollen source in Geraardsbergen. cypress, grass, and willow are not currently active.
When is pollen season in Geraardsbergen?
How often is the Geraardsbergen pollen forecast updated?
The Geraardsbergen pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Geraardsbergen 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 Geraardsbergen 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 Geraardsbergen, 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).
