SmogRank / Countries / United Kingdom / March 2026
Most polluted cities in United Kingdom, March 2026
58 cities in United Kingdom ranked by their average PM2.5 over the 31 days. Worst: Plymouth at 14.2 µg/m³, #580 of 2,332 cities in the world. Cleanest: Penicuik at 4.6. A city needs measurements on 70% of the days to be ranked.
- 1PlymouthEngland 14.2
- 2NorthamptonEngland 14.1
- 3LondonEngland 14.0
- 4SouthamptonEngland 13.8
- 5HayesEngland 13.7
- 5Cambridgelow-cost sensorsEngland 13.7
- 7BexleyEngland 13.1
- 8Manchesterlow-cost sensorsEngland 13.0
- 9LeedsEngland 12.9
- 10ReadingEngland 12.4
- 11CardiffWales 12.3
- 12BrightonEngland 12.2
- 13Clacton-on-SeaEngland 12.1
- 14LutonEngland 11.9
- 14DoncasterEngland 11.9
- 14Canvey IslandEngland 11.9
- 17ScunthorpeEngland 11.7
- 17PortsmouthEngland 11.7
- 17DartfordEngland 11.7
- 20SeafordEngland 11.6
- 21Birminghamlow-cost sensorsEngland 11.3
- 21AndoverEngland 11.3
- 23WiganEngland 11.2
- 24NottinghamEngland 11.1
- 25SheffieldEngland 11.0
- 25LiverpoolEngland 11.0
- 25LeicesterEngland 11.0
- 25DerbyEngland 11.0
- 29NorwichEngland 10.8
- 30Stoke-on-TrentEngland 10.7
- 30OxfordEngland 10.7
- 32Westburylow-cost sensorsEngland 10.5
- 32NewportWales 10.5
- 32CannockEngland 10.5
- 32BarnsleyEngland 10.5
- 36BristolEngland 10.3
- 37SpekeEngland 10.2
- 37NewmarketEngland 10.2
- 37Kingston upon HullEngland 10.2
- 40Royal Leamington SpaEngland 10.1
- 41YorkEngland 10.0
- 42ChesterfieldEngland 9.8
- 42Cheadle HulmeEngland 9.8
- 44WarringtonEngland 9.6
- 44Newcastle upon TyneEngland 9.6
- 46PrestonEngland 9.4
- 47SunderlandEngland 9.3
- 48SaltashEngland 8.7
- 48IrlamEngland 8.7
- 50BelfastNorthern Ireland 8.6
- 51High PeakEngland 8.5
- 52MiddlesbroughEngland 8.1
- 53Briton FerryWales 7.7
- 54GlasgowScotland 7.3
- 55GrangemouthScotland 5.6
- 56EdinburghScotland 5.5
- 57DerryNorthern Ireland 5.3
- 58PenicuikScotland 4.6
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+