Knokke-Heist pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Knokke-Heist is moderate; mugwort is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
7-Day Trend
Over the next week grass and mugwort will increase; cypress 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) | Moderate | 40/100 |
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) | Moderate | 38/100 |
Local Environmental Conditions
Knokke-Heist, on the Belgian North Sea coast, draws most of its pollen from birch and oak among local trees, with grass and nettle pollen contributing from farmland and green corridors around West-Vlaanderen. The built environment here creates a patchy exposure pattern, generally higher near parks and lower along the busiest streets.
In West-Vlaanderen, Knokke-Heist experiences alder and hazel first, a birch and oak peak in the middle of spring, and grass and nettle pollen through early summer, spanning the January-to-August window. mugwort and ragweed extend exposure modestly into early autumn near open farmland. The town's position on the Belgian North Sea coast plays into how the season plays out.
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Resource Hub
Sports venues in Knokke-Heist 1 sports venue
Frequently Asked Questions About Pollen in West-Vlaanderen
Is pollen high in Knokke-Heist right now?
On 20 September 2026, overall pollen levels in Knokke-Heist are moderate. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Knokke-Heist tomorrow?
On 21 September 2026, pollen conditions in Knokke-Heist will be similar to today, with artemisia at moderate levels
Is pollen expected to decrease in Knokke-Heist this week?
According to the five-day outlook, artemisia and grass pollen levels will increase later in the week.
Which pollen types are currently active in Knokke-Heist?
On 20 September 2026, Artemisia is the dominant pollen source in Knokke-Heist. cypress, grass, and willow are not currently active.
When is pollen season in Knokke-Heist?
How often is the Knokke-Heist pollen forecast updated?
The Knokke-Heist pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Knokke-Heist 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 Knokke-Heist 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 Knokke-Heist, 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).
