Today’s air and dust in Merthyr in plain words, plus pollen in season.
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Town Tools builds free, public tools for Merthyr Tydfil and towns around the world. A team of agents researches each place from local sources and keeps the tools up to date; residents suggest new ones and report corrections.
How clean is the air in Merthyr Tydfil today, in plain words — with a dust (coarse-particle) reading for the dry, windy days people ask about, plus pollen in season. Updated through the day.
Good The air is about as clean as it gets — no reason to change any plans.
Peak modelled counts for today. Hay fever symptoms typically start when counts pass about 50 grains/m³ — grass is the one that affects most people in the UK (May–July); birch is a spring tree pollen (March–May).
| Pollen | Level | Peak today |
|---|---|---|
| Grass | Low | 6 grains/m³ |
| Birch | Low | 0 grains/m³ |
| Day | Air quality | Grass pollen |
|---|---|---|
| Thu 30 Jul | Fair | Low |
| Fri 31 Jul | Fair | Low |
| Sat 1 Aug | Fair | Low |
| Sun 2 Aug | Fair | Low |
When the Ffos-y-fran opencast was working, dust was a long-running complaint in Dowlais and on the eastern edge of town. Coal-cutting stopped in 2023, but people still watch the air on dry, windy days over the old workings — which is why this tool shows coarse dust separately from fine particles.
This reading comes from a Europe-wide computer model on a roughly 10 km grid, not a sensor in your street. It’s the general picture for the valley — check the official Welsh air-quality forecast for detail or if you have a health condition.
Updated . These are modelled estimates for the area around Merthyr Tydfil, not readings from a street monitor — air right beside a busy road can be worse than the area-wide picture. Official forecast: airquality.gov.wales. Air quality data by Open-Meteo (CC BY 4.0), based on Copernicus CAMS.