Tonstad pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Tonstad is none
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort at low levels.
7-Day Trend
Over the next week mugwort will decrease; cypress, grass, 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) | Low | 7/100 |
Local Environmental Conditions
Tonstad is a small Agder inland village in the Sira valley where birch, alder, and riverside vegetation are the main local pollen sources. The enclosed valley concentrates pollen under calm conditions, while the Sirafjord hydropower landscape contributes limited additional vegetation and the Atlantic-influenced southwestern Norwegian climate provides frequent rainfall interruptions. Birch peaks through April and May before grass contributes through June and July throughout.
For Tonstad, the pollen season covers the period from February through August, led in by alder and hazel as early as February, then birch dominates with a pronounced peak which carries through May. Grass pollen then carries the season across June and July. With the sheltered skerries and coastal woodland near Tonstad, the local climate adds its own local variation on top of the general national pattern.
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Frequently Asked Questions About Pollen in Agder
Is pollen high in Tonstad right now?
Currently, there is no significant pollen in Tonstad.
Will pollen levels change in Tonstad tomorrow?
On 21 September 2026, pollen conditions in Tonstad will be different from today, with artemisia at low levels
Is pollen expected to decrease in Tonstad this week?
According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Tonstad?
On 20 September 2026, there are no significant pollen types in Tonstad.
When is pollen season in Tonstad?
How often is the Tonstad pollen forecast updated?
The Tonstad pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Tonstad 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 Tonstad 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 Tonstad, 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).
