Alkmaar pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Alkmaar 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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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 | 35/100 |
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 | 43/100 |
Local Environmental Conditions
Alkmaar's North Holland Canal corridor and surrounding bulb field landscape feature oak, birch, and alder as the main tree pollen sources, with exposure varying between these green areas and the more built-up city centre. The coastal dune landscape to the west and flat polder to the east create distinct pollen zones, while surrounding farmland contributes substantial grass and crop pollen.
Alkmaar's pollen season runs from January through August, opening with hazel and alder from January before birch peaks through April and May. Grass pollen peaks through June and July. The North Holland bulb fields contribute distinctive crop pollen through spring, while the coastal dune landscape and flat polder farmland allow substantial grass and crop pollen to extend into August under prevailing westerly winds.
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Frequently Asked Questions About Pollen in Noord-Holland
Is pollen high in Alkmaar right now?
On 20 September 2026, overall pollen levels in Alkmaar are moderate. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Alkmaar tomorrow?
On 21 September 2026, pollen conditions in Alkmaar will be similar to today, with artemisia at moderate levels
Is pollen expected to decrease in Alkmaar 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 Alkmaar?
On 20 September 2026, Artemisia is the dominant pollen source in Alkmaar. willow, cypress, and grass are not currently active.
When is pollen season in Alkmaar?
How often is the Alkmaar pollen forecast updated?
The Alkmaar pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Alkmaar 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 Alkmaar 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 Alkmaar, 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).
