SmogRank / World / United Kingdom / July 2025

Most polluted cities in United Kingdom, July 2025

59 cities in United Kingdom ranked by their average PM2.5 over the 31 days. Worst: Cardiff at 9.9 µg/m³, #1,173 of 2,499 cities in the world. Cleanest: Derry at 3.5. A city needs measurements on 70% of the days to be ranked.

← Cardiff 9.9 µg/m³ 20 µg/m³0
Every city in United Kingdom ranked for July 2025, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1CardiffWales
    52
  2. 2SpekeEngland
    47
  3. 3DartfordEngland
    46
  4. 4NorthamptonEngland
    43
  5. 5LondonEngland
    42
  6. 6Manchesterlow-cost sensorsEngland
    42
  7. 7ScunthorpeEngland
    41
  8. 8Kingston upon HullEngland
    38
  9. 9Stoke-on-TrentEngland
    36
  10. 9LeedsEngland
    36
  11. 11Cheadle HulmeEngland
    36
  12. 12DoncasterEngland
    35
  13. 13BexleyEngland
    34
  14. 13Canvey IslandEngland
    34
  15. 15SouthamptonEngland
    34
  16. 15PrestonEngland
    34
  17. 17PlymouthEngland
    33
  18. 17LeicesterEngland
    33
  19. 19LutonEngland
    33
  20. 19DerbyEngland
    33
  21. 19Birminghamlow-cost sensorsEngland
    33
  22. 22SheffieldEngland
    32
  23. 22NottinghamEngland
    32
  24. 22Newcastle upon TyneEngland
    32
  25. 22Clacton-on-SeaEngland
    32
  26. 22BristolEngland
    32
  27. 27NorwichEngland
    32
  28. 27HayesEngland
    32
  29. 27BrightonEngland
    32
  30. 27BelfastNorthern Ireland
    32
  31. 31WiganEngland
    31
  32. 31Royal Leamington SpaEngland
    31
  33. 31Briton FerryWales
    31
  34. 34PortsmouthEngland
    31
  35. 34NewmarketEngland
    31
  36. 34IrlamEngland
    31
  37. 34CannockEngland
    31
  38. 34BarnsleyEngland
    31
  39. 39YorkEngland
    29
  40. 39SunderlandEngland
    29
  41. 39LiverpoolEngland
    29
  42. 39ChesterfieldEngland
    29
  43. 43SeafordEngland
    29
  44. 44GlasgowScotland
    28
  45. 44EdinburghScotland
    28
  46. 44BarnstapleEngland
    28
  47. 47ReadingEngland
    28
  48. 47AndoverEngland
    28
  49. 49High PeakEngland
    27
  50. 50NewportWales
    27
  51. 51MiddlesbroughEngland
    26
  52. 52OxfordEngland
    25
  53. 53WarringtonEngland
    23
  54. 53GillinghamEngland
    23
  55. 55PenicuikScotland
    22
  56. 56Newton AbbotEngland
    21
  57. 57GrangemouthScotland
    20
  58. 58SaltashEngland
    19
  59. 58DerryNorthern Ireland
    19
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

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

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SmogRank, most polluted cities in United Kingdom, PM2.5, July 2025, smogrank.com/gb/history/2025-07 (accessed 2 Oct 2026).

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