Worst air pollution Llanelli, today and tomorrow
Today (16 July): Air quality in Llanelli is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 34.0/100).
Tomorrow (17 July 2026): Air quality in Llanelli is fair. AQI improves to medium; NO2 increases to fair; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 43.6/100). 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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The nearby M4 corridor contributes steady vehicle emissions that affect roadside readings. Air quality in Llanelli is shaped by its location in Carmarthenshire, where vehicle traffic and everyday urban activity dominate local sources. Inland breezes from the surrounding countryside help ventilate the town centre, keeping air quality at moderate levels typical for the region.
Today - 16 July | Pollution peaks at 15:00
AQI:
Fair
34.0/100
PM2.5 (fine particles):
Good
9.7/100
PM10 (coarse particles):
Good
3.3/100
NO2 (nitrogen dioxide):
Good
16.4/100
O3 (ozone):
Fair
34.0/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
9.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 16:00
AQI:
Medium
43.6/100
PM2.5 (fine particles):
Good
13.3/100
PM10 (coarse particles):
Good
4.5/100
NO2 (nitrogen dioxide):
Fair
22.3/100
O3 (ozone):
Medium
43.6/100
SO2 (sulfur dioxide):
Good
3.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Good
12.4/100
Pollen forecast in Llanelli
View pollen forecastFrequently Asked Questions
Is air quality bad in Llanelli right now?
On 16 July 2026, overall air quality in Llanelli is fair. AQI is the main air quality indicator at 34.0/100. Pollution peaks around 3:00 PM (O3: 34.0/100).
Will air quality be worse tomorrow in Llanelli?
On 17 July 2026, air quality conditions in Llanelli will be similar to today, with NO2 forecast at fair at 22.3/100. Pollution peaks around 4:00 PM (O3: 43.6/100).
When is air pollution at its worst in Llanelli?
Spring and autumn are typically the easiest months, air-quality-wise, for most residents. Here's the thing about Llanelli: air quality has a clear seasonal rhythm. Come winter, NO₂ and PM2.5 usually creep up, as heating and calmer air let M4 traffic emissions linger rather than disperse. Warmer months swap one problem for another — less smoke and heating pollution, but more ozone on the sunniest days.
Are air quality levels in Llanelli 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