Harlingen pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Harlingen is none
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort at moderate levels.
7-Day Trend
Over the next week grass will increase; mugwort will decrease; 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) | 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 | 34/100 |
Local Environmental Conditions
Around Harlingen, oak, birch, and linden are the leading tree pollen contributors in parks and residential streets, though levels vary noticeably between the dense centre and the leafier edges of town. Nearby, the Wadden Sea coast together with Fryslân farmland contributes further grass and tree pollen, in keeping with Harlingen's character as a Wadden Sea port town.
Harlingen's pollen season stretches from January to August, starting with hazel and alder catkins in deep winter before birch takes over through April. Oak and ash step in during April and May, after which grass becomes the standout source over June and July. Local dispersal is influenced by the Wadden Sea coast, and the historic ferry port to the Wadden Islands is characteristic of Harlingen and its surroundings.
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Frequently Asked Questions About Pollen in Fryslân
Is pollen high in Harlingen right now?
Currently, there is no significant pollen in Harlingen.
Will pollen levels change in Harlingen tomorrow?
On 21 September 2026, pollen conditions in Harlingen will be different from today, with artemisia at moderate levels
Is pollen expected to decrease in Harlingen this week?
According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, while grass pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Harlingen?
On 20 September 2026, there are no significant pollen types in Harlingen.
When is pollen season in Harlingen?
How often is the Harlingen pollen forecast updated?
The Harlingen pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Harlingen 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 Harlingen 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 Harlingen, 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).
