Worst air pollution Dolgellau, today and tomorrow
Today (16 July): Air quality in Dolgellau 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 Dolgellau is fair. All 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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Dolgellau sits within Gwynedd, and its air quality profile is driven mainly by road traffic and the density of the centre. The M4 sees the heaviest traffic, and that shows up clearly in local roadside monitoring. The region's typical south-westerlies 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
12.1/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Good
13.7/100
O3 (ozone):
Fair
28.5/100
SO2 (sulfur dioxide):
Good
3.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.1/100
PM1 (ultrafine particles):
Good
9.6/100
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
17.0/100
PM10 (coarse particles):
Good
6.0/100
NO2 (nitrogen dioxide):
Good
19.3/100
O3 (ozone):
Fair
31.9/100
SO2 (sulfur dioxide):
Good
5.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.1/100
PM1 (ultrafine particles):
Good
14.0/100
Pollen forecast in Dolgellau
View pollen forecastFrequently Asked Questions
Is air quality bad in Dolgellau right now?
On 16 July 2026, overall air quality in Dolgellau 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 Dolgellau?
On 17 July 2026, air quality conditions in Dolgellau 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 Dolgellau?
Dolgellau's air quality follows a familiar seasonal pattern most UK towns share. Summer sunshine can drive up ozone locally, though overall air generally moves and clears more freely than in winter. In deep winter, a lack of wind lets M4 traffic fumes and woodsmoke settle instead of blowing through. Spring and autumn usually sit somewhere in between, so it's really the extremes of the year worth watching.
Are air quality levels in Dolgellau 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