Braine-l'Alleud pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Braine-l'Alleud 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 | 28/100 |
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 | 23/100 |
Local Environmental Conditions
Vegetation patterns around Braine-l'Alleud reflect its setting on the Walloon Brabant plain south of Brussels: birch and oak lead the tree pollen count, and grass and late-season herbs from the surrounding Waals-Brabant countryside adds a further layer through the season. Local parks and street trees create pockets of higher exposure near the greener parts of town.
birch and oak defines the core of Braine-l'Alleud's pollen season after an early alder and hazel start, with grass and late-season herbs stretching exposure into summer across the January-to-August window. mugwort and ragweed extend exposure modestly into early autumn near open farmland. Braine-l'Alleud sits on the Walloon Brabant plain south of Brussels, which shapes the tail end of the cycle.
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Frequently Asked Questions About Pollen in Waals-Brabant
Is pollen high in Braine-l'Alleud right now?
On 20 September 2026, overall pollen levels in Braine-l'Alleud are moderate. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Braine-l'Alleud tomorrow?
On 21 September 2026, pollen conditions in Braine-l'Alleud will be different from today, with artemisia continuing to decline
Is pollen expected to decrease in Braine-l'Alleud this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Braine-l'Alleud?
On 20 September 2026, Artemisia is the dominant pollen source in Braine-l'Alleud. willow, cypress, and grass are not currently active.
When is pollen season in Braine-l'Alleud?
How often is the Braine-l'Alleud pollen forecast updated?
The Braine-l'Alleud pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Braine-l'Alleud 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 Braine-l'Alleud 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 Braine-l'Alleud, 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).
