Gorseinon pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Gorseinon is moderate; mugwort is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort remains moderate, grass at low levels.
7-Day Trend
Over the next week grass will increase; mugwort will decrease; 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) | Moderate | 29/100 |
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) | Low | 5/100 | |
| Willow (Salicaceae) | None | 0/100 | |
| Mugwort (Artemisia) | Moderate | 50/100 |
Local Environmental Conditions
Around Gorseinon, birch and oak are the dominant species behind local tree pollen, with counts higher near parks than in the centre. Local farmland and hedgerows nearby add meaningful grass pollen through late spring and summer, especially under the area's changeable Atlantic weather. This combination means residents feel both urban and rural pollen sources depending on which way the wind's blowing.
For Gorseinon, the season kicks off with birch and then hands things over to oak. Don't forget grass, either — it runs May to September and usually causes the most trouble in June and July. Birch pollen typically runs from March to May, while oak follows on from April to May. Worth keeping an eye on the forecast if you're sensitive.
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Frequently Asked Questions About Pollen in Swansea
Is pollen high in Gorseinon right now?
On 20 September 2026, overall pollen levels in Gorseinon are moderate. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Gorseinon tomorrow?
On 21 September 2026, pollen conditions in Gorseinon will be different from today, with artemisia at moderate levels, grass at low levels
Is pollen expected to decrease in Gorseinon this week?
According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, while grass pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Gorseinon?
On 20 September 2026, Artemisia is the dominant pollen source in Gorseinon. cypress, grass, and willow are not currently active.
When is pollen season in Gorseinon?
How often is the Gorseinon pollen forecast updated?
The Gorseinon pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Gorseinon 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 Gorseinon 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 Gorseinon, 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).
