Today’s air and dust in Merthyr in plain words, plus pollen in season.
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.
Fair Fine for being outside, including exercise, for almost everyone.
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 | Moderate | 44 grains/m³ |
| Birch | Low | 0 grains/m³ |
| Day | Air quality | Grass pollen |
|---|---|---|
| Wed 15 Jul | Fair | Moderate |
| Thu 16 Jul | Moderate | High |
| Fri 17 Jul | Moderate | High |
| Sat 18 Jul | Fair | — |
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.