Worst air pollution Carmarthen, today and tomorrow

On 9 August 2026, overall air quality in Carmarthen is poor. AQI is the main air quality indicator at 79.5/100. Pollution peaks around 5:00 AM (NO2: 79.5/100).

On 10 August 2026, air quality conditions in Carmarthen will be better than today, with AQI forecast at fair at 38.6/100. Pollution peaks around 9:00 PM (NO2: 38.6/100).

Here's the thing about Carmarthen: air quality has a clear seasonal rhythm. Once the heating goes on and the air turns still, pollution from the M4 and nearby chimneys tends to build up rather than clear. By summer, ozone tends to rise on bright days, while better ventilation generally keeps particulate and NO₂ levels lower than winter. Spring and autumn tend to be the calmer, more moderate stretches by comparison.

It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.

Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.

During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.