Worst air pollution Colwyn Bay, today and tomorrow
Today (16 July): Air quality in Colwyn Bay is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 28.4/100).
Tomorrow (17 July 2026): Air quality in Colwyn Bay is fair. PM2.5 increases to fair; all other pollutants stay as today. Pollution peaks around 5:00 AM (NO2: 30.5/100). 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 M4 sees the heaviest traffic, and that shows up clearly in local roadside monitoring. Colwyn Bay sits within Conwy, and its air quality profile is driven mainly by road traffic and the density of the centre. Easterly winds tend to disperse pollutants reasonably well, keeping readings close to typical UK small-town levels.
Today - 16 July | Pollution peaks at 15:00
AQI:
Fair
28.4/100
PM2.5 (fine particles):
Good
16.0/100
PM10 (coarse particles):
Good
5.6/100
NO2 (nitrogen dioxide):
Fair
24.1/100
O3 (ozone):
Fair
28.4/100
SO2 (sulfur dioxide):
Good
6.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.8/100
PM1 (ultrafine particles):
Good
12.4/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 05:00
AQI:
Fair
30.5/100
PM2.5 (fine particles):
Fair
21.0/100
PM10 (coarse particles):
Good
7.6/100
NO2 (nitrogen dioxide):
Fair
30.5/100
O3 (ozone):
Fair
29.3/100
SO2 (sulfur dioxide):
Good
9.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.1/100
PM1 (ultrafine particles):
Good
16.9/100
Pollen forecast in Colwyn Bay
View pollen forecastFrequently Asked Questions
Is air quality bad in Colwyn Bay right now?
On 16 July 2026, overall air quality in Colwyn Bay is fair. AQI is the main air quality indicator at 28.4/100. Pollution peaks around 3:00 PM (O3: 28.4/100).
Will air quality be worse tomorrow in Colwyn Bay?
On 17 July 2026, air quality conditions in Colwyn Bay will be similar to today, with AQI forecast at fair at 30.5/100. Pollution peaks around 5:00 AM (NO2: 30.5/100).
When is air pollution at its worst in Colwyn Bay?
You can roughly predict Colwyn Bay's air quality just by knowing the time of year. The coldest months usually bring the worst readings, as heating and temperature inversions keep M4 emissions from dispersing normally. In summer, ozone can build up on sunny afternoons, though windier, warmer weather usually helps clear traffic-related pollution faster than in winter. The shoulder seasons generally bring the mildest readings of the year.
Are air quality levels in Colwyn Bay 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.
Want to see air quality forecasts for other cities in United Kingdom?
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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