Norrtälje pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Norrtälje 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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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
Norrtälje's tree pollen comes mainly from pine, birch, and oak growing in parks and along residential streets rather than the compact centre. Farmland close to the Roslagen archipelago adds a steady stream of grass and crop pollen through the growing season. Local tourism and forestry does not add materially to vegetation-related pollen, which instead reflects the surrounding rural landscape.
The pollen calendar in Norrtälje starts in February with alder, followed by a strong birch peak in May. Grass takes over from birch through the summer months of June and July. The character of the Roslagen archipelago nearby gives Norrtälje a somewhat variable day-to-day pollen pattern tied to local wind shifts. Tourism and forestry in the area matters little for pollen; it is the pine forest and farmland belt that extends the season.
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Frequently Asked Questions About Pollen in Stockholm
Is pollen high in Norrtälje right now?
Currently, there is no significant pollen in Norrtälje.
Will pollen levels change in Norrtälje tomorrow?
On 21 September 2026, pollen conditions in Norrtälje will be similar to today with no significant pollen expected.
Is pollen expected to decrease in Norrtälje this week?
According to the five-day outlook, pollen levels are expected to remain relatively stable.
Which pollen types are currently active in Norrtälje?
On 20 September 2026, there are no significant pollen types in Norrtälje.
When is pollen season in Norrtälje?
How often is the Norrtälje pollen forecast updated?
The Norrtälje pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Norrtälje 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 Norrtälje 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 Norrtälje, 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).
