Maarssen pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Maarssen is none
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort at moderate levels.
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) | None | 0/100 |
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 | 26/100 |
Local Environmental Conditions
In Maarssen, tree pollen comes chiefly from oak, birch, and linden planted through parks and streets, and the split between built-up and green areas makes a real difference to exposure. As a riverside estate village, Maarssen also picks up grass and tree pollen from the Vecht river and the surrounding Utrecht farmland.
Pollen exposure in Maarssen gets underway in January courtesy of hazel and alder, climbs to a birch high point around April, and lasts until August. Through April and May, oak and ash add to the load, with grass then leading through June and into July. How pollen settles around Maarssen owes something to the Vecht river, with the country estates along the Vecht shaping conditions further.
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Frequently Asked Questions About Pollen in Utrecht
Is pollen high in Maarssen right now?
Currently, there is no significant pollen in Maarssen.
Will pollen levels change in Maarssen tomorrow?
On 21 September 2026, pollen conditions in Maarssen will be different from today, with artemisia at moderate levels
Is pollen expected to decrease in Maarssen this week?
According to the five-day outlook, grass and artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Maarssen?
On 20 September 2026, there are no significant pollen types in Maarssen.
When is pollen season in Maarssen?
How often is the Maarssen pollen forecast updated?
The Maarssen pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Maarssen 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 Maarssen 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 Maarssen, 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).
