Croydon pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Croydon 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
Tree pollen in Croydon comes mostly from sycamore and oak, with parks and mature gardens standing in contrast to the more built-up centre. The coastal fringe nearby is a notable secondary source, feeding pollen into town whenever the wind shifts to the south. This mix of urban and rural influence gives Croydon a fairly typical pollen pattern for the wider region.
Ask anyone with allergies in Croydon and they'll tell you it's sycamore and oak that cause the trouble. Grass pollen then stretches from May into September, with the worst of it typically landing in June and July. Sycamore gets going around April and tapers off by June, before oak takes over, usually April to May. Not a bad idea to stock up on antihistamines before it all kicks off.
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Frequently Asked Questions About Pollen in Croydon
Is pollen high in Croydon right now?
On 20 September 2026, overall pollen levels in Croydon are high. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Croydon tomorrow?
On 21 September 2026, pollen conditions in Croydon will be similar to today, with artemisia at high levels
Is pollen expected to decrease in Croydon 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 Croydon?
On 20 September 2026, Artemisia is the dominant pollen source in Croydon. grass, willow, and cypress are not currently active.
When is pollen season in Croydon?
How often is the Croydon pollen forecast updated?
The Croydon pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Croydon 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 Croydon 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 Croydon, 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).
