Harderwijk pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Harderwijk is none
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort at low levels.
7-Day Trend
Over the next week mugwort will increase; cypress, grass, and willow will remain stable.
Explore Forecasts
Air Quality
Pollen in Other Cities
Air Quality in Other Cities
Get More in Our App
Local pollen and air quality forecasts, interactive pollen maps and route profiles
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) | Low | 13/100 |
Local Environmental Conditions
Harderwijk's Veluwe woodland fringe and the IJsselmeer waterfront feature oak, birch, and pine as the main tree pollen sources, with exposure varying between the wooded Veluwe edge and the more built-up city centre. The Veluwe heathland and woodland are a particularly significant local pollen source, while the IJsselmeer coastal position means onshore winds can periodically disperse pollen across the historic Hanseatic city.
Harderwijk's pollen season runs from January through August, opening with hazel and alder from January before birch peaks through April. Oak and pine follow through April and May, with grass peaking through June and July. The Veluwe woodland makes tree pollen a particularly significant spring source, while the IJsselmeer coastal position means onshore winds can periodically interrupt exposure and surrounding farmland extends grass pollen into August.
Get pollen & AQ on Strava
Follow your environmental exposure and performance with the free Airmine-Strava integration. See your pollen and air quality exposure for every Strava activity.
Resource Hub
Frequently Asked Questions About Pollen in Gelderland
Is pollen high in Harderwijk right now?
Currently, there is no significant pollen in Harderwijk.
Will pollen levels change in Harderwijk tomorrow?
On 21 September 2026, pollen conditions in Harderwijk will be different from today, with artemisia at low levels
Is pollen expected to decrease in Harderwijk this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Harderwijk?
On 20 September 2026, there are no significant pollen types in Harderwijk.
When is pollen season in Harderwijk?
How often is the Harderwijk pollen forecast updated?
The Harderwijk pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Harderwijk 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 Harderwijk 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 Harderwijk, 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).
