SmogRank / Countries / Canada / September 2025

Most polluted cities in Canada, September 2025

96 cities in Canada ranked by their average PM2.5 over the 30 days. Worst: Fort McMurray at 26.1 µg/m³, #81 of 2,439 cities in the world. Cleanest: Charlottetown at 2.7. A city needs measurements on 70% of the days to be ranked.

  1. 1Fort McMurrayAlberta
    26.1
  2. 2EdmontonAlberta
    25.6
  3. 3Grande PrairieAlberta
    24.8
  4. 4CalgaryAlberta
    24.0
  5. 5Prince GeorgeBritish Columbia
    21.6
  6. 6St. AlbertAlberta
    21.4
  7. 7Sherwood ParkAlberta
    20.3
  8. 8Red DeerAlberta
    20.2
  9. 9LethbridgeAlberta
    19.8
  10. 10CranbrookBritish Columbia
    18.2
  11. 11SquamishBritish Columbia
    17.0
  12. 12Fort St. JohnBritish Columbia
    15.6
  13. 12VernonBritish Columbia
    15.6
  14. 14KelownaBritish Columbia
    15.4
  15. 15SaskatoonSaskatchewan
    15.2
  16. 16Swift CurrentSaskatchewan
    14.7
  17. 17Prince AlbertSaskatchewan
    14.3
  18. 18Medicine HatAlberta
    14.2
  19. 19KamloopsBritish Columbia
    13.6
  20. 20WindsorOntario
    12.1
  21. 21ReginaSaskatchewan
    11.9
  22. 22West VancouverBritish Columbia
    10.6
  23. 23ChilliwackBritish Columbia
    10.2
  24. 24MissionBritish Columbia
    9.6
  25. 25AbbotsfordBritish Columbia
    8.9
  26. 26CoquitlamBritish Columbia
    8.5
  27. 27Nepeanlow-cost sensorsOntario
    8.3
  28. 28BarrieOntario
    8.1
  29. 28VancouverBritish Columbia
    8.1
  30. 30LondonOntario
    8.0
  31. 31BurnabyBritish Columbia
    7.9
  32. 32North VancouverBritish Columbia
    7.7
  33. 32Port CoquitlamBritish Columbia
    7.7
  34. 34LangleyBritish Columbia
    7.5
  35. 34TorontoOntario
    7.5
  36. 36Strawberry HillBritish Columbia
    7.4
  37. 37MiltonOntario
    7.2
  38. 37Port AlberniBritish Columbia
    7.2
  39. 39HamiltonOntario
    7.1
  40. 40NanaimoBritish Columbia
    7.0
  41. 41BrantfordOntario
    6.9
  42. 41SarniaOntario
    6.9
  43. 41St. CatharinesOntario
    6.9
  44. 44KitchenerOntario
    6.8
  45. 44Sorel-TracyQuebec
    6.8
  46. 46DuncanBritish Columbia
    6.6
  47. 46OakvilleOntario
    6.6
  48. 46RichmondBritish Columbia
    6.6
  49. 49BramptonOntario
    6.5
  50. 50NewmarketOntario
    6.4
  51. 50VictoriaBritish Columbia
    6.4
  52. 52MississaugaOntario
    6.3
  53. 52MontréalQuebec
    6.3
  54. 54ChathamOntario
    6.1
  55. 54GuelphOntario
    6.1
  56. 56TerraceBritish Columbia
    6.0
  57. 56WaterdownOntario
    6.0
  58. 58St. ThomasOntario
    5.9
  59. 59DorvalQuebec
    5.8
  60. 60DeltaBritish Columbia
    5.7
  61. 60LangfordBritish Columbia
    5.7
  62. 62BrossardQuebec
    5.6
  63. 62CornwallOntario
    5.6
  64. 62GranbyQuebec
    5.6
  65. 62North CowichanBritish Columbia
    5.6
  66. 62Rivière-des-Prairies–Pointe-aux-TremblesQuebec
    5.6
  67. 67QuébecQuebec
    5.5
  68. 68KingstonOntario
    5.3
  69. 69BellevilleOntario
    5.2
  70. 69Gatineaulow-cost sensorsQuebec
    5.2
  71. 69L'Ancienne-LoretteQuebec
    5.2
  72. 72Greater SudburyOntario
    5.1
  73. 72HarewoodBritish Columbia
    5.1
  74. 74Campbell RiverBritish Columbia
    5.0
  75. 74ShawiniganQuebec
    5.0
  76. 74Trois-RivièresQuebec
    5.0
  77. 77AllistonOntario
    4.9
  78. 77OttawaOntario
    4.9
  79. 77Sault Ste. MarieOntario
    4.9
  80. 80DrummondvilleQuebec
    4.8
  81. 80EdmundstonNew Brunswick
    4.8
  82. 82North BayOntario
    4.7
  83. 82PeterboroughOntario
    4.7
  84. 84SaguenayQuebec
    4.5
  85. 85SherbrookeQuebec
    4.3
  86. 86Saint JohnNew Brunswick
    4.2
  87. 87Sept-ÎlesQuebec
    4.1
  88. 88Rouyn-NorandaQuebec
    4.0
  89. 89Saint-Jean-sur-RichelieuQuebec
    3.9
  90. 90MonctonNew Brunswick
    3.8
  91. 91FrederictonNew Brunswick
    3.5
  92. 92MiramichiNew Brunswick
    3.1
  93. 93DartmouthNova Scotia
    3.0
  94. 93WhitehorseYukon
    3.0
  95. 95SydneyNova Scotia
    2.9
  96. 96CharlottetownPrince Edward Island
    2.7
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, September 2025 · Canada now