SmogRank / Countries / United Kingdom / October 2025
Most polluted cities in United Kingdom, October 2025
55 cities in United Kingdom ranked by their average PM2.5 over the 31 days. Worst: Dartford at 10.0 µg/m³, #397 of 2,110 cities in the world. Cleanest: Derry at 3.1. A city needs measurements on 70% of the days to be ranked.
- 1DartfordEngland 10.0
- 2WiganEngland 9.1
- 3SpekeEngland 8.8
- 3LeicesterEngland 8.8
- 5LeedsEngland 8.5
- 6Stoke-on-TrentEngland 8.4
- 6HayesEngland 8.4
- 6DoncasterEngland 8.4
- 9ScunthorpeEngland 8.3
- 10LiverpoolEngland 8.2
- 11PrestonEngland 8.1
- 11Manchesterlow-cost sensorsEngland 8.1
- 11DerbyEngland 8.1
- 14NottinghamEngland 8.0
- 15LondonEngland 7.9
- 16SheffieldEngland 7.8
- 16Cheadle HulmeEngland 7.8
- 18LutonEngland 7.7
- 19BarnsleyEngland 7.4
- 20IrlamEngland 7.3
- 20ChesterfieldEngland 7.3
- 22Kingston upon HullEngland 7.2
- 23Birminghamlow-cost sensorsEngland 7.0
- 24NewportWales 6.9
- 25PlymouthEngland 6.7
- 26SouthamptonEngland 6.6
- 26Cambridgelow-cost sensorsEngland 6.6
- 26BristolEngland 6.6
- 26Canvey IslandEngland 6.6
- 30High PeakEngland 6.4
- 31BarnstapleEngland 6.3
- 32NewmarketEngland 6.1
- 33NorwichEngland 6.0
- 33Newcastle upon TyneEngland 6.0
- 33BelfastNorthern Ireland 6.0
- 36Royal Leamington SpaEngland 5.9
- 36BexleyEngland 5.9
- 38SunderlandEngland 5.7
- 39PortsmouthEngland 5.5
- 39Clacton-on-SeaEngland 5.5
- 41ReadingEngland 5.4
- 41GlasgowScotland 5.4
- 41BrightonEngland 5.4
- 41AndoverEngland 5.4
- 45YorkEngland 5.3
- 45SeafordEngland 5.3
- 45GillinghamEngland 5.3
- 48GrangemouthScotland 5.1
- 49OxfordEngland 5.0
- 49EdinburghScotland 5.0
- 51SaltashEngland 4.9
- 51Newton AbbotEngland 4.9
- 53MiddlesbroughEngland 4.8
- 54Briton FerryWales 4.4
- 55DerryNorthern Ireland 3.1
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+