Merthyr Tudful pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Merthyr Tudful is low; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort increasing, grass at low levels.
7-Day Trend
Over the next week grass and mugwort will decrease; cypress 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) | Low | 8/100 |
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 | 10/100 | |
| Willow (Salicaceae) | None | 0/100 | |
| Mugwort (Artemisia) | Moderate | 37/100 |
Local Environmental Conditions
Merthyr Tudful's parks and green spaces feature oak and ash as the main tree pollen sources, with exposure varying between these greener areas and the more built-up town centre. Grass pollen from surrounding Merthyr Tydfil fields is significant through the summer months, carried in by the area's changeable Atlantic weather. Locals with allergies tend to plan around two peaks a year rather than one long stretch.
Want to know what triggers spring allergies in Merthyr Tudful? Start with oak, then ash. Oak gets going around April and tapers off by May, before ash takes over, usually March to May. Grass pollen then stretches from May into September, with the worst of it typically landing in June and July. Worth keeping an eye on the forecast if you're sensitive.
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Frequently Asked Questions About Pollen in Merthyr Tydfil
Is pollen high in Merthyr Tudful right now?
On 20 September 2026, overall pollen levels in Merthyr Tudful are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Merthyr Tudful tomorrow?
On 21 September 2026, pollen conditions in Merthyr Tudful will be different from today, with grass at low levels and artemisia increasing
Is pollen expected to decrease in Merthyr Tudful this week?
According to the five-day outlook, grass and artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Merthyr Tudful?
On 20 September 2026, Artemisia is the dominant pollen source in Merthyr Tudful. cypress, grass, and willow are not currently active.
When is pollen season in Merthyr Tudful?
How often is the Merthyr Tudful pollen forecast updated?
The Merthyr Tudful pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Merthyr Tudful 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 Merthyr Tudful 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 Merthyr Tudful, 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).
