Osterøy kommune pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Osterøy kommune is low; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort no longer expected.
7-Day Trend
Over the next week mugwort will increase; 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) | Low | 4/100 |
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
Set on the Osterøy island in the Osterfjord east of Bergen, Osterøy opens the pollen season with hazel and alder from February before birch peaks through April and May. Grass from surrounding island farmland peaks through June and July before mugwort extends exposure into September. The Osterfjord island position means onshore winds can periodically disperse pollen, while the very wet Bergen-area Atlantic climate provides very frequent rainfall interruptions throughout.
Osterøy kommune's pollen calendar begins in April and continues through August, with the first releases of alder and hazel beginning in April, before birch pollen takes hold most strongly which carries through June. Osterøy kommune then sees grass pollen continue into the following June and July. With the extreme seasonal swing between polar night and midnight sun near Osterøy kommune, the local climate shapes a season that runs a little differently than the Norwegian average.
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Frequently Asked Questions About Pollen in Vestland
Is pollen high in Osterøy kommune right now?
On 20 September 2026, overall pollen levels in Osterøy kommune are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Osterøy kommune tomorrow?
On 21 September 2026, pollen conditions in Osterøy kommune will be similar to today with no significant pollen expected.
Is pollen expected to decrease in Osterøy kommune this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Osterøy kommune?
On 20 September 2026, Artemisia is the dominant pollen source in Osterøy kommune. cypress, grass, and willow are not currently active.
When is pollen season in Osterøy kommune?
How often is the Osterøy kommune pollen forecast updated?
The Osterøy kommune pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Osterøy kommune 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 Osterøy kommune 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 Osterøy kommune, 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).
