Isleworth pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Isleworth is moderate; mugwort is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort increasing.
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) | Moderate | 43/100 |
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 | 56/100 |
Local Environmental Conditions
Isleworth's parks and green spaces feature oak and birch as the main tree pollen sources, with exposure varying between these greener areas and the more built-up town centre. Local farmland and hedgerows nearby add meaningful grass pollen through late spring and summer, especially under southwesterly winds. It's a pattern shared by plenty of similarly sized towns nearby, shaped more by geography than anything unusual locally.
Locals in Isleworth usually notice oak first, with birch not far behind it. Don't forget grass, either — it runs May to September and usually causes the most trouble in June and July. You'll usually see oak pollen from around April through May, while birch follows on from March to May. Worth keeping an eye on the forecast if you're sensitive.
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Frequently Asked Questions About Pollen in Hounslow
Is pollen high in Isleworth right now?
On 20 September 2026, overall pollen levels in Isleworth are moderate. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Isleworth tomorrow?
On 21 September 2026, pollen conditions in Isleworth will be different from today, with artemisia increasing
Is pollen expected to decrease in Isleworth this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Isleworth?
On 20 September 2026, Artemisia is the dominant pollen source in Isleworth. cypress, grass, and willow are not currently active.
When is pollen season in Isleworth?
How often is the Isleworth pollen forecast updated?
The Isleworth pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Isleworth 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 Isleworth 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 Isleworth, 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).
