Roskilde pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (11 September) pollen in Roskilde is low; mugwort is low.
Pollen Tomorrow
Tomorrow (12 September 2026) mugwort increasing, grass at low levels.
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
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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) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 23/100 |
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 | 16/100 | |
| Willow (Salicaceae) | None | 0/100 | |
| Mugwort (Artemisia) | Moderate | 37/100 |
Local Environmental Conditions
Roskilde's historic cathedral quarter and the Viking Ship Museum grounds are shaded by lime, oak, and birch, giving the old town a denser canopy than most Zealand towns its size. Zealand's grain belt surrounds Roskilde on the landward side, adding grass and cereal pollen, while the sheltered inner fjord limits how quickly onshore winds can clear it.
Roskilde's pollen season opens with hazel and alder from January, birch dominates strongly through April and May given the town's many mature cathedral-quarter trees, and grass takes over June and July. At the southern, sheltered end of Roskilde Fjord, the town gets less consistent wind assistance than towns positioned closer to the open Kattegat.
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Frequently Asked Questions About Pollen in Sjælland
Is pollen high in Roskilde right now?
On 11 September 2026, overall pollen levels in Roskilde are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Roskilde tomorrow?
On 12 September 2026, pollen conditions in Roskilde will be different from today, with grass at low levels and artemisia increasing
Is pollen expected to decrease in Roskilde this week?
According to the five-day outlook, grass and artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Roskilde?
On 11 September 2026, Artemisia is the dominant pollen source in Roskilde. cypress, grass, and willow are not currently active.
When is pollen season in Roskilde?
How often is the Roskilde pollen forecast updated?
The Roskilde pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Roskilde 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 Roskilde 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 Roskilde, 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).
