Threemilestone pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Threemilestone is moderate; mugwort is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort increasing.
7-Day Trend
Over the next week grass and mugwort will increase; cypress and willow 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) | Moderate | 49/100 |
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) | High | 52/100 |
Local Environmental Conditions
Tree pollen in Threemilestone comes mostly from birch and lime, with parks and mature gardens standing in contrast to the more built-up centre. The wider Cornwall countryside supplies additional tree and grass pollen, particularly when moist Atlantic fronts carry it toward the built-up area. This combination means residents feel both urban and rural pollen sources depending on which way the wind's blowing.
Ask anyone with allergies in Threemilestone and they'll tell you it's birch and lime that cause the trouble. Expect birch pollen roughly from March to May, while lime follows on from May to July. Grass then takes over from May right through September, peaking around June and July for most people. Worth keeping an eye on the forecast if you're sensitive.
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Frequently Asked Questions About Pollen in Cornwall
Is pollen high in Threemilestone right now?
On 20 September 2026, overall pollen levels in Threemilestone are moderate. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Threemilestone tomorrow?
On 21 September 2026, pollen conditions in Threemilestone will be different from today, with artemisia increasing
Is pollen expected to decrease in Threemilestone this week?
According to the five-day outlook, artemisia and grass pollen levels will increase later in the week.
Which pollen types are currently active in Threemilestone?
On 20 September 2026, Artemisia is the dominant pollen source in Threemilestone. cypress, grass, and willow are not currently active.
When is pollen season in Threemilestone?
How often is the Threemilestone pollen forecast updated?
The Threemilestone pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Threemilestone 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 Threemilestone 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 Threemilestone, 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).
