Worst air pollution Llandeilo, today and tomorrow
Today (16 July): Air quality in Llandeilo is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 31.6/100).
Tomorrow (17 July 2026): Air quality in Llandeilo is fair. All pollutants stay as today. Pollution peaks around 3:00 PM (O3: 37.8/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Llandeilo's position in Carmarthenshire means air quality is mostly determined by local road traffic and the compact scale of the centre. The region's typical south-westerlies tend to disperse pollutants reasonably well, keeping readings close to typical UK small-town levels. Rush-hour queues near the M4 are usually when readings climb the most.
Today - 16 July | Pollution peaks at 16:00
AQI:
Fair
31.6/100
PM2.5 (fine particles):
Good
9.0/100
PM10 (coarse particles):
Good
3.2/100
NO2 (nitrogen dioxide):
Good
14.5/100
O3 (ozone):
Fair
31.6/100
SO2 (sulfur dioxide):
Good
2.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.8/100
PM1 (ultrafine particles):
Good
7.9/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 15:00
AQI:
Fair
37.8/100
PM2.5 (fine particles):
Good
13.9/100
PM10 (coarse particles):
Good
4.8/100
NO2 (nitrogen dioxide):
Good
19.6/100
O3 (ozone):
Fair
37.8/100
SO2 (sulfur dioxide):
Good
4.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.0/100
PM1 (ultrafine particles):
Good
12.4/100
Pollen forecast in Llandeilo
View pollen forecastFrequently Asked Questions
Is air quality bad in Llandeilo right now?
On 16 July 2026, overall air quality in Llandeilo is fair. AQI is the main air quality indicator at 31.6/100. Pollution peaks around 4:00 PM (O3: 31.6/100).
Will air quality be worse tomorrow in Llandeilo?
On 17 July 2026, air quality conditions in Llandeilo will be similar to today, with AQI forecast at fair at 37.8/100. Pollution peaks around 3:00 PM (O3: 37.8/100).
When is air pollution at its worst in Llandeilo?
Spring and autumn usually sit somewhere in between, so it's really the extremes of the year worth watching. Here's the thing about Llandeilo: 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. In summer, ozone can build up on sunny afternoons, though windier, warmer weather usually helps clear traffic-related pollution faster than in winter.
Are air quality levels in Llandeilo based on measurements or forecasts?
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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app