Worst air pollution Barmouth, today and tomorrow
Today (16 July): Air quality in Barmouth is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (O3: 28.5/100).
Tomorrow (17 July 2026): Air quality in Barmouth is fair. NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 3:00 PM (O3: 31.9/100). 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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Commuter traffic feeding onto the A55 adds a further, consistent contribution to local readings. Barmouth sits within Gwynedd, and its air quality profile is driven mainly by road traffic and the density of the centre. The prevailing Atlantic airflow do most of the work keeping things in check, more so than any local policy or infrastructure change.
Today - 16 July | Pollution peaks at 14:00
AQI:
Fair
28.5/100
PM2.5 (fine particles):
Good
13.5/100
PM10 (coarse particles):
Good
4.7/100
NO2 (nitrogen dioxide):
Good
18.0/100
O3 (ozone):
Fair
28.5/100
SO2 (sulfur dioxide):
Good
4.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.1/100
PM1 (ultrafine particles):
Good
10.7/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 15:00
AQI:
Fair
31.9/100
PM2.5 (fine particles):
Good
19.0/100
PM10 (coarse particles):
Good
6.7/100
NO2 (nitrogen dioxide):
Fair
23.9/100
O3 (ozone):
Fair
31.9/100
SO2 (sulfur dioxide):
Good
7.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.1/100
PM1 (ultrafine particles):
Good
15.7/100
Pollen forecast in Barmouth
View pollen forecastFrequently Asked Questions
Is air quality bad in Barmouth right now?
On 16 July 2026, overall air quality in Barmouth is fair. AQI is the main air quality indicator at 28.5/100. Pollution peaks around 2:00 PM (O3: 28.5/100).
Will air quality be worse tomorrow in Barmouth?
On 17 July 2026, air quality conditions in Barmouth will be similar to today, with AQI forecast at fair at 31.9/100. Pollution peaks around 3:00 PM (O3: 31.9/100).
When is air pollution at its worst in Barmouth?
If you're tracking air quality in Barmouth, expect it to move around quite a bit through the year. Warmer months swap one problem for another — less smoke and heating pollution, but more ozone on the sunniest days. The coldest months usually bring the worst readings, as heating and temperature inversions keep A55 emissions from dispersing normally. Spring and autumn usually sit somewhere in between, so it's really the extremes of the year worth watching.
Are air quality levels in Barmouth 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