Worst air pollution Brecon, today and tomorrow
Today (16 July): Air quality in Brecon is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 31.6/100).
Tomorrow (17 July 2026): Air quality in Brecon 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.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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The air quality picture in Brecon reflects a typical Powys town, with traffic emissions and local commercial activity as key contributors. Prevailing westerlies help ventilate the town centre, keeping air quality at moderate levels typical for the region. The nearby A483 corridor contributes steady vehicle emissions that affect roadside readings.
Today - 16 July | Pollution peaks at 16:00
AQI:
Fair
31.6/100
PM2.5 (fine particles):
Good
10.1/100
PM10 (coarse particles):
Good
3.6/100
NO2 (nitrogen dioxide):
Fair
20.3/100
O3 (ozone):
Fair
31.6/100
SO2 (sulfur dioxide):
Good
3.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.8/100
PM1 (ultrafine particles):
Good
8.9/100
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
15.6/100
PM10 (coarse particles):
Good
5.4/100
NO2 (nitrogen dioxide):
Fair
25.5/100
O3 (ozone):
Fair
37.8/100
SO2 (sulfur dioxide):
Good
5.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.0/100
PM1 (ultrafine particles):
Good
13.9/100
Pollen forecast in Brecon
View pollen forecastFrequently Asked Questions
Is air quality bad in Brecon right now?
On 16 July 2026, overall air quality in Brecon 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 Brecon?
On 17 July 2026, air quality conditions in Brecon 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 Brecon?
There's a clear yearly cycle to air quality in Brecon if you look closely. Summer's more of a mixed bag: ozone can spike in strong sun, but overall dispersion tends to be better than the depths of winter. In deep winter, a lack of wind lets A483 traffic fumes and woodsmoke settle instead of blowing through. For much of spring and autumn, things settle into a fairly unremarkable middle ground.
Are air quality levels in Brecon 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