London pollen forecast — Olympic Park & Stratford neighborhood
Pollen Today
Today (20 September) pollen in Olympic Park & Stratford, London is moderate; mugwort is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
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 | 26/100 |
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) | Moderate | 40/100 |
Local Environmental Conditions
Residents in Olympic Park & Stratford dealing with hay fever usually point to oak and birch as the culprits, particularly in spring near parks and gardens. The wider London, City of countryside supplies additional tree and grass pollen, particularly when southwesterly winds carry it toward the built-up area. Locals with allergies tend to plan around two peaks a year rather than one long stretch.
Ask anyone with allergies in Olympic Park & Stratford and they'll tell you it's oak and birch that cause the trouble. Expect oak pollen roughly from April to May, then birch carries on from March until May. Don't forget grass, either — it runs May to September and usually causes the most trouble in June and July. Worth factoring in if hay fever's ever been an issue for you here.
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Frequently Asked Questions About Pollen in London, City of
Is pollen high in London right now?
On 20 September 2026, overall pollen levels in London are moderate. Artemisia is the main contributor to airborne pollen
Will pollen levels change in London tomorrow?
On 21 September 2026, pollen conditions in London will be similar to today, with artemisia at moderate levels
Is pollen expected to decrease in London this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in London?
On 20 September 2026, Artemisia is the dominant pollen source in London. cypress, grass, and willow are not currently active.
When is pollen season in London?
How often is the London pollen forecast updated?
The London pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in London 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 London 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 London, 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. |
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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).
