Worst air pollution Builth Wells, today and tomorrow
Today (16 July): Air quality in Builth Wells is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (NO2: 36.9/100).
Tomorrow (17 July 2026): Air quality in Builth Wells is fair. AQI improves to medium; PM2.5 increases to fair; NO2 decreases to medium; all other pollutants stay as today. Pollution peaks around 1:00 AM (NO2: 43.4/100). 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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Rush-hour queues near the A55 are usually when readings climb the most. The air quality picture in Builth Wells reflects a typical Powys town, with traffic emissions and local commercial activity as key contributors. The prevailing Atlantic airflow offer a degree of natural ventilation, keeping pollution broadly in line with comparable UK towns.
Today - 16 July | Pollution peaks at 23:00
AQI:
Fair
36.9/100
PM2.5 (fine particles):
Good
14.5/100
PM10 (coarse particles):
Good
5.2/100
NO2 (nitrogen dioxide):
Fair
36.9/100
O3 (ozone):
Fair
31.6/100
SO2 (sulfur dioxide):
Good
7.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.8/100
PM1 (ultrafine particles):
Good
12.7/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 01:00
AQI:
Medium
43.4/100
PM2.5 (fine particles):
Fair
22.0/100
PM10 (coarse particles):
Good
7.7/100
NO2 (nitrogen dioxide):
Medium
43.4/100
O3 (ozone):
Fair
37.8/100
SO2 (sulfur dioxide):
Good
11.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.0/100
PM1 (ultrafine particles):
Good
19.8/100
Pollen forecast in Builth Wells
View pollen forecastFrequently Asked Questions
Is air quality bad in Builth Wells right now?
On 16 July 2026, overall air quality in Builth Wells is fair. AQI is the main air quality indicator at 36.9/100. Pollution peaks around 11:00 PM (NO2: 36.9/100).
Will air quality be worse tomorrow in Builth Wells?
On 17 July 2026, air quality conditions in Builth Wells will be similar to today, with O3 forecast at fair at 37.8/100. Pollution peaks around 1:00 AM (NO2: 43.4/100).
When is air pollution at its worst in Builth Wells?
You can roughly predict Builth Wells's air quality just by knowing the time of year. In deep winter, a lack of wind lets A55 traffic fumes and woodsmoke settle instead of blowing through. In summer, ozone can build up on sunny afternoons, though windier, warmer weather usually helps clear traffic-related pollution faster than in winter. Spring and autumn don't usually cause much concern, sitting comfortably between winter's peak and summer's ozone spikes.
Are air quality levels in Builth Wells 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