Thornton Heath pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Thornton Heath is high; mugwort is high.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
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) | High | 51/100 |
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 | 62/100 |
Local Environmental Conditions
In Thornton Heath, oak and beech dominate the local tree pollen picture, with parks and tree-lined residential streets offering more exposure than the compact centre. The the river meadows nearby is a notable secondary source, feeding pollen into town whenever the wind shifts to the inland. Overall exposure follows the broader regional trend, moderated somewhat by the town's parks and gardens.
Ask anyone with allergies in Thornton Heath and they'll tell you it's oak and beech that cause the trouble. Oak gets going around April and tapers off by May, while beech follows on from April to 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 Croydon
Is pollen high in Thornton Heath right now?
On 20 September 2026, overall pollen levels in Thornton Heath are high. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Thornton Heath tomorrow?
On 21 September 2026, pollen conditions in Thornton Heath will be similar to today, with artemisia at high levels
Is pollen expected to decrease in Thornton Heath this week?
According to the five-day outlook, grass and artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Thornton Heath?
On 20 September 2026, Artemisia is the dominant pollen source in Thornton Heath. grass, willow, and cypress are not currently active.
When is pollen season in Thornton Heath?
How often is the Thornton Heath pollen forecast updated?
The Thornton Heath pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Thornton Heath 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 Thornton Heath 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 Thornton Heath, 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).
