SmogRank / Countries / United Kingdom / December 2025

Most polluted cities in United Kingdom, December 2025

59 cities in United Kingdom ranked by their average PM2.5 over the 31 days. Worst: Northampton at 10.5 µg/m³, #874 of 2,360 cities in the world. Cleanest: Penicuik at 3.1. A city needs measurements on 70% of the days to be ranked.

  1. 1NorthamptonEngland
    10.5
  2. 2PlymouthEngland
    9.4
  3. 2LondonEngland
    9.4
  4. 4ScunthorpeEngland
    9.3
  5. 5CardiffWales
    9.2
  6. 6LeedsEngland
    9.1
  7. 7BrightonEngland
    8.4
  8. 7BelfastNorthern Ireland
    8.4
  9. 9SouthamptonEngland
    8.2
  10. 10BexleyEngland
    8.0
  11. 11LutonEngland
    7.9
  12. 11HayesEngland
    7.9
  13. 11Canvey IslandEngland
    7.9
  14. 14DoncasterEngland
    7.8
  15. 15WiganEngland
    7.6
  16. 15PortsmouthEngland
    7.6
  17. 15Manchesterlow-cost sensorsEngland
    7.6
  18. 15Kingston upon HullEngland
    7.6
  19. 15DerbyEngland
    7.6
  20. 20NottinghamEngland
    7.5
  21. 21SeafordEngland
    7.4
  22. 21GillinghamEngland
    7.4
  23. 21BristolEngland
    7.4
  24. 24LeicesterEngland
    7.3
  25. 24Clacton-on-SeaEngland
    7.3
  26. 24Birminghamlow-cost sensorsEngland
    7.3
  27. 27YorkEngland
    7.2
  28. 27Stoke-on-TrentEngland
    7.2
  29. 27NorwichEngland
    7.2
  30. 30NewportWales
    7.1
  31. 31ChesterfieldEngland
    7.0
  32. 32SheffieldEngland
    6.9
  33. 33ReadingEngland
    6.8
  34. 33Newcastle upon TyneEngland
    6.8
  35. 33GrangemouthScotland
    6.8
  36. 36WarringtonEngland
    6.7
  37. 36SunderlandEngland
    6.7
  38. 36Cambridgelow-cost sensorsEngland
    6.7
  39. 39Royal Leamington SpaEngland
    6.6
  40. 39BarnsleyEngland
    6.6
  41. 41SpekeEngland
    6.5
  42. 41CannockEngland
    6.5
  43. 43DerryNorthern Ireland
    6.4
  44. 44PrestonEngland
    6.3
  45. 44NewmarketEngland
    6.3
  46. 46LiverpoolEngland
    6.1
  47. 46Cheadle HulmeEngland
    6.1
  48. 48DartfordEngland
    5.8
  49. 48AndoverEngland
    5.8
  50. 50IrlamEngland
    5.7
  51. 50GlasgowScotland
    5.7
  52. 52OxfordEngland
    5.6
  53. 53SaltashEngland
    5.3
  54. 54Briton FerryWales
    5.2
  55. 55High PeakEngland
    4.8
  56. 56Newton AbbotEngland
    4.7
  57. 57MiddlesbroughEngland
    4.6
  58. 58EdinburghScotland
    4.5
  59. 59PenicuikScotland
    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+

All cities in the world, December 2025 · United Kingdom now

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SmogRank, most polluted cities in United Kingdom, PM2.5, December 2025, smogrank.com/gb/history/2025-12 (accessed 2 Oct 2026).

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