Worst air pollution Chester, today and tomorrow
Today (16 July): Air quality in Chester is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 28.4/100).
Tomorrow (17 July 2026): Air quality in Chester is fair. All pollutants stay as today. Pollution peaks around 2:00 PM (O3: 29.3/100). 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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Being part of Cheshire West and Chester, Chester sees an air quality profile that's largely down to traffic and general town-centre activity. Onshore breezes generally provide reasonable ventilation, keeping levels close to typical UK urban averages for a town this size. The M90 generates consistent traffic-related NO₂ and PM2.5, particularly during peak commuting hours.
Today - 16 July | Pollution peaks at 15:00
AQI:
Fair
28.4/100
PM2.5 (fine particles):
Good
9.8/100
PM10 (coarse particles):
Good
3.4/100
NO2 (nitrogen dioxide):
Good
5.6/100
O3 (ozone):
Fair
28.4/100
SO2 (sulfur dioxide):
Good
1.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.8/100
PM1 (ultrafine particles):
Good
7.6/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 14:00
AQI:
Fair
29.3/100
PM2.5 (fine particles):
Good
13.0/100
PM10 (coarse particles):
Good
4.6/100
NO2 (nitrogen dioxide):
Good
7.6/100
O3 (ozone):
Fair
29.3/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.1/100
PM1 (ultrafine particles):
Good
10.4/100
Pollen forecast in Chester
View pollen forecastFrequently Asked Questions
Is air quality bad in Chester right now?
On 16 July 2026, overall air quality in Chester 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 Chester?
On 17 July 2026, air quality conditions in Chester will be similar to today, with AQI forecast at fair at 29.3/100. Pollution peaks around 2:00 PM (O3: 29.3/100).
When is air pollution at its worst in Chester?
You can roughly predict Chester's air quality just by knowing the time of year. In summer, ozone can build up on sunny afternoons, though windier, warmer weather usually helps clear traffic-related pollution faster than in winter. Once the heating goes on and the air turns still, pollution from the M90 and nearby chimneys tends to build up rather than clear. Spring and autumn usually sit somewhere in between, so it's really the extremes of the year worth watching.
Are air quality levels in Chester 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