Trondheim pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Trondheim is none
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
7-Day Trend
Over the next week cypress, grass, willow, and mugwort will remain stable.
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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) | None | 0/100 |
Local Environmental Conditions
Trondheim's coastal setting on the Trondheimsfjord features birch, alder, and pine as the main tree pollen sources in parks and along streets, with exposure varying between green areas and the more built-up city centre. Surrounding Trøndelag farmland and the Norwegian fjord woodland contribute substantial tree and grass pollen, while the fjord position means onshore winds can periodically disperse urban pollen.
The annual pollen season around Trondheim plays out between March and August, with alder and hazel setting things in motion picking up from March, then birch dominates with a pronounced peak through May. Grass follows and holds through June and July. With the broad agricultural plains typical of this part of Trøndelag, the local climate means the exact timing here can shift a little from year to year.
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Frequently Asked Questions About Pollen in Trøndelag
Is pollen high in Trondheim right now?
Currently, there is no significant pollen in Trondheim.
Will pollen levels change in Trondheim tomorrow?
On 21 September 2026, pollen conditions in Trondheim will be similar to today with no significant pollen expected.
Is pollen expected to decrease in Trondheim this week?
According to the five-day outlook, pollen levels are expected to remain relatively stable.
Which pollen types are currently active in Trondheim?
On 20 September 2026, there are no significant pollen types in Trondheim.
When is pollen season in Trondheim?
How often is the Trondheim pollen forecast updated?
The Trondheim pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Trondheim 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 Trondheim 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 Trondheim, 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).
