Sint-Niklaas pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Sint-Niklaas is moderate; mugwort is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort declining.
7-Day Trend
Over the next week grass and mugwort will increase; cypress 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 | 30/100 |
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 | 25/100 |
Local Environmental Conditions
birch and plane lead the local pollen count in Sint-Niklaas, which sits on the Flemish lowland plain; grass pollen from the wider Oost-Vlaanderen landscape adds to totals as spring gives way to summer. Exposure tends to track green space closely, with the busiest streets generally registering lower counts.
From an early hazel and willow start, Sint-Niklaas moves into a birch and plane peak before grass pollen extends the season into early summer, with the January-to-August window covering the year's exposure in this part of Oost-Vlaanderen. mugwort and ragweed extend exposure modestly into early autumn near open farmland, a pattern shaped in part by the town's position on the Flemish lowland plain.
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Frequently Asked Questions About Pollen in Flanders
Is pollen high in Sint-Niklaas right now?
On 20 September 2026, overall pollen levels in Sint-Niklaas are moderate. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Sint-Niklaas tomorrow?
On 21 September 2026, pollen conditions in Sint-Niklaas will be different from today, with artemisia continuing to decline
Is pollen expected to decrease in Sint-Niklaas 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 Sint-Niklaas?
On 20 September 2026, Artemisia is the dominant pollen source in Sint-Niklaas. cypress, grass, and willow are not currently active.
When is pollen season in Sint-Niklaas?
How often is the Sint-Niklaas pollen forecast updated?
The Sint-Niklaas pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Sint-Niklaas 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 Sint-Niklaas 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 Sint-Niklaas, 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).
