Fosby pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (11 September) pollen in Fosby is low; grass and mugwort are low.
Pollen Tomorrow
Tomorrow (12 September 2026) levels are similar to today.
7-Day Trend
Over the next week grass and mugwort will decrease; cypress and willow will remain stable.
Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset. Airmine's estimates use satellites to map local vegetation and a statistical prediction model, updated four times daily. Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS) team.
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Air Quality
Air Quality Forecast for Fosby AQI today AQI tomorrowPollen in Other Cities
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Pollen Risk
Today - 11 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) | Low | 8/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 8/100 |
Tomorrow - 12 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) | Low | 13/100 | |
| Willow (Salicaceae) | None | 0/100 | |
| Mugwort (Artemisia) | Low | 12/100 |
Local Environmental Conditions
Fosby is a small Østfold agricultural village in Halden municipality where birch, hazel, and farmland edge vegetation are the main local pollen sources. The flat, open southeastern Norwegian landscape allows pollen to disperse widely, while the relatively dry Østfold climate means fewer rainfall interruptions than in western Norway and the season opens early with hazel from January before birch peaks through April and grass through June and July.
Across Fosby, the pollen season stretches from February through August, with alder and hazel marking the early stage from the start of February, before birch surges to its highest levels into May. Grass pollen picks up next through June and July. With the mild, productive lowlands surrounding Fosby, the local climate means local conditions can matter as much as the calendar month itself.
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Frequently Asked Questions About Pollen in Østfold
Is pollen high in Fosby right now?
On 11 September 2026, overall pollen levels in Fosby are low. Artemisia is the main contributor to airborne pollen, while grass remain at lower levels
Will pollen levels change in Fosby tomorrow?
On 12 September 2026, pollen conditions in Fosby will be similar to today, with artemisia at low levels, grass at low levels
Is pollen expected to decrease in Fosby this week?
According to the five-day outlook, artemisia and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Fosby?
On 11 September 2026, Artemisia is the dominant pollen source in Fosby. grass are also present but at lower levels. cypress and willow are not currently active.
When is pollen season in Fosby?
How often is the Fosby pollen forecast updated?
The Fosby pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Fosby 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 Fosby 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 Fosby, 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 exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen exposure is expected to be at or near its highest levels. |
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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).
