Welwyn Garden City Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (10 October) pollen in Welwyn Garden City is moderate; mold (cladosporium) is moderate; mold (alternaria) is low.
Pollen Tomorrow
Tomorrow (11 October 2026) mold (alternaria) remains low, mold (cladosporium) remains moderate, mugwort at low levels.
7-Day Trend
Over the next week mugwort will increase; mold (alternaria) and mold (cladosporium) will decrease; cypress, grass, and willow will remain stable.
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Pollen Risk
Today - 10 October
| 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) | None | 0/100 |
| Mold (Alternaria) | Low | 7/100 |
| Mold (Cladosporium) | Moderate | 26/100 |
Tomorrow - 11 October
| 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) | Low | 4/100 | |
| Mold (Alternaria) | Low | 8/100 | |
| Mold (Cladosporium) | Moderate | 27/100 |
Local Environmental Conditions
The heart of Welwyn Garden City sits among a blend of woodland and built-up land. Oak is the most prominent allergenic tree nearby, with maple and birch also present. Grass pollen is significant here, and plantain and pigweed contribute weed pollen. Locally, street trees, gardens and lawns supply most pollen in the built-up parts.
Tree pollen peaks in late spring, when the weather warms to around 10°C and oak, maple and birch are in full flower. Grasses take over in early summer and keep pollen in the air into late summer. Later, plantain and pigweed keep weed pollen in the air from late spring into late summer. By late fall, as temperatures fall to around 10°C, pollen levels are low again.
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Frequently Asked Questions About Pollen in Hertfordshire
Is pollen high in Welwyn Garden City right now?
Currently, there is no significant pollen in Welwyn Garden City.
Will pollen levels change in Welwyn Garden City tomorrow?
On 11 October 2026, pollen conditions in Welwyn Garden City will be different from today, with artemisia at low levels
Is pollen expected to decrease in Welwyn Garden City this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Welwyn Garden City?
On 10 October 2026, there are no significant pollen types in Welwyn Garden City.
When is pollen season in Welwyn Garden City?
How often is the Welwyn Garden City pollen forecast updated?
The Welwyn Garden City pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Welwyn Garden City 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 Welwyn Garden City 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 Welwyn Garden City, 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 pollen scores represent risk levels, not direct pollen measurements. Higher scores indicate higher risk.
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).
