SmogRank / Countries / Canada / August 2025

Most polluted cities in Canada, August 2025

94 cities in Canada ranked by their average PM2.5 over the 31 days. Worst: Fort McMurray at 35.0 µg/m³, #31 of 2,289 cities in the world. Cleanest: Whitehorse at 2.9. A city needs measurements on 70% of the days to be ranked.

  1. 1Fort McMurrayAlberta
    35.0
  2. 2Winnipeglow-cost sensorsManitoba
    20.6
  3. 3Prince AlbertSaskatchewan
    19.9
  4. 4WindsorOntario
    15.7
  5. 5Nepeanlow-cost sensorsOntario
    15.4
  6. 6TorontoOntario
    15.3
  7. 7NewmarketOntario
    15.2
  8. 8MiltonOntario
    15.1
  9. 9SaskatoonSaskatchewan
    15.0
  10. 10BrantfordOntario
    14.8
  11. 11LondonOntario
    14.6
  12. 12KitchenerOntario
    14.2
  13. 13BarrieOntario
    14.1
  14. 14BramptonOntario
    13.9
  15. 14OakvilleOntario
    13.9
  16. 16HamiltonOntario
    13.7
  17. 16Sault Ste. MarieOntario
    13.7
  18. 18ReginaSaskatchewan
    13.6
  19. 18SarniaOntario
    13.6
  20. 20St. CatharinesOntario
    13.5
  21. 21EdmontonAlberta
    13.3
  22. 22GuelphOntario
    13.0
  23. 23MississaugaOntario
    12.9
  24. 23St. ThomasOntario
    12.9
  25. 25GranbyQuebec
    12.8
  26. 25WaterdownOntario
    12.8
  27. 27AllistonOntario
    12.7
  28. 27Rouyn-NorandaQuebec
    12.7
  29. 29Port AlberniBritish Columbia
    12.6
  30. 30BellevilleOntario
    12.0
  31. 30PeterboroughOntario
    12.0
  32. 32Grande PrairieAlberta
    11.9
  33. 33KingstonOntario
    11.5
  34. 34ChathamOntario
    11.2
  35. 35DorvalQuebec
    11.0
  36. 36CornwallOntario
    10.7
  37. 36MontréalQuebec
    10.7
  38. 38Prince GeorgeBritish Columbia
    10.6
  39. 38Sorel-TracyQuebec
    10.6
  40. 40Greater SudburyOntario
    10.5
  41. 41OttawaOntario
    10.3
  42. 42QuébecQuebec
    10.2
  43. 43North BayOntario
    9.9
  44. 44SaguenayQuebec
    9.8
  45. 44Rivière-des-Prairies–Pointe-aux-TremblesQuebec
    9.8
  46. 46DrummondvilleQuebec
    9.4
  47. 46St. AlbertAlberta
    9.4
  48. 48Sherwood ParkAlberta
    9.3
  49. 49ShawiniganQuebec
    9.2
  50. 49Trois-RivièresQuebec
    9.2
  51. 51SherbrookeQuebec
    9.1
  52. 51Swift CurrentSaskatchewan
    9.1
  53. 53CalgaryAlberta
    8.7
  54. 54EdmundstonNew Brunswick
    8.6
  55. 55Saint-Jean-sur-RichelieuQuebec
    8.4
  56. 55SquamishBritish Columbia
    8.4
  57. 57Fort St. JohnBritish Columbia
    8.3
  58. 57Medicine HatAlberta
    8.3
  59. 59ChilliwackBritish Columbia
    8.2
  60. 59L'Ancienne-LoretteQuebec
    8.2
  61. 61Sept-ÎlesQuebec
    7.8
  62. 62KamloopsBritish Columbia
    7.7
  63. 63NanaimoBritish Columbia
    7.4
  64. 64AbbotsfordBritish Columbia
    7.3
  65. 64Red DeerAlberta
    7.3
  66. 66MissionBritish Columbia
    7.1
  67. 67LethbridgeAlberta
    7.0
  68. 68BurnabyBritish Columbia
    6.7
  69. 68CranbrookBritish Columbia
    6.7
  70. 68Port CoquitlamBritish Columbia
    6.7
  71. 71CoquitlamBritish Columbia
    6.6
  72. 71MonctonNew Brunswick
    6.6
  73. 71VancouverBritish Columbia
    6.6
  74. 74MiramichiNew Brunswick
    6.5
  75. 75VernonBritish Columbia
    6.4
  76. 75West VancouverBritish Columbia
    6.4
  77. 77LangleyBritish Columbia
    6.2
  78. 77VictoriaBritish Columbia
    6.2
  79. 79FrederictonNew Brunswick
    6.1
  80. 79KelownaBritish Columbia
    6.1
  81. 81Strawberry HillBritish Columbia
    5.9
  82. 82DuncanBritish Columbia
    5.8
  83. 82RichmondBritish Columbia
    5.8
  84. 84Saint JohnNew Brunswick
    5.7
  85. 85DeltaBritish Columbia
    5.4
  86. 85North VancouverBritish Columbia
    5.4
  87. 87CharlottetownPrince Edward Island
    5.2
  88. 87North CowichanBritish Columbia
    5.2
  89. 89LangfordBritish Columbia
    5.1
  90. 89TerraceBritish Columbia
    5.1
  91. 91HarewoodBritish Columbia
    4.9
  92. 92DartmouthNova Scotia
    4.8
  93. 93SydneyNova Scotia
    4.7
  94. 94WhitehorseYukon
    2.9
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, August 2025 · Canada now