SmogRank / World / Canada / October 2026

Most polluted cities in Canada, October 2026

86 cities in Canada ranked by their average PM2.5 so far (1 of 31 days). Worst: Nepean at 16.0 µg/m³, #181 of 1,630 cities in the world. Cleanest: Yellowknife at 0.0. A city needs measurements on 70% of the days to be ranked.

← Nepean 16.0 µg/m³ 20 µg/m³0
Every city in Canada ranked for October 2026, 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. 1Nepeanlow-cost sensorsOntario
    64
  2. 2Prince GeorgeBritish Columbia
    59
  3. 3WindsorOntario
    55
  4. 4Gatineaulow-cost sensorsQuebec
    55
  5. 4NewmarketOntario
    55
  6. 6ChathamOntario
    54
  7. 6ShawiniganQuebec
    54
  8. 8SarniaOntario
    54
  9. 9KitchenerOntario
    53
  10. 10St. ThomasOntario
    53
  11. 11GuelphOntario
    53
  12. 12HamiltonOntario
    52
  13. 13TorontoOntario
    52
  14. 14OakvilleOntario
    51
  15. 15LondonOntario
    49
  16. 15WaterdownOntario
    49
  17. 17BramptonOntario
    48
  18. 18Sorel-TracyQuebec
    46
  19. 19MississaugaOntario
    46
  20. 19Saint-Jean-sur-RichelieuQuebec
    46
  21. 19Sept-ÎlesQuebec
    46
  22. 22BellevilleOntario
    45
  23. 23BrantfordOntario
    44
  24. 23St. CatharinesOntario
    44
  25. 23L'Ancienne-LoretteQuebec
    44
  26. 26QuébecQuebec
    44
  27. 27CornwallOntario
    42
  28. 28Saint-GeorgesQuebec
    40
  29. 29SaskatoonSaskatchewan
    39
  30. 29EdmundstonNew Brunswick
    39
  31. 31LethbridgeAlberta
    39
  32. 32KingstonOntario
    38
  33. 33EdmontonAlberta
    38
  34. 34AbbotsfordBritish Columbia
    37
  35. 34Red DeerAlberta
    37
  36. 36Trois-RivièresQuebec
    37
  37. 37BrossardQuebec
    36
  38. 37DeltaBritish Columbia
    36
  39. 37Greater SudburyOntario
    36
  40. 37MontréalQuebec
    36
  41. 37PeterboroughOntario
    36
  42. 42BarrieOntario
    36
  43. 42OttawaOntario
    36
  44. 42Rivière-des-Prairies–Pointe-aux-TremblesQuebec
    36
  45. 45BurnabyBritish Columbia
    35
  46. 46RichmondBritish Columbia
    33
  47. 46Strawberry HillBritish Columbia
    33
  48. 48AllistonOntario
    33
  49. 49GranbyQuebec
    31
  50. 50LangleyBritish Columbia
    31
  51. 50VancouverBritish Columbia
    31
  52. 52North BayOntario
    29
  53. 52ReginaSaskatchewan
    29
  54. 54CranbrookBritish Columbia
    29
  55. 54SaguenayQuebec
    29
  56. 56CalgaryAlberta
    28
  57. 56DrummondvilleQuebec
    28
  58. 58Sault Ste. MarieOntario
    28
  59. 59SherbrookeQuebec
    27
  60. 60VernonBritish Columbia
    27
  61. 61AirdrieAlberta
    26
  62. 61Medicine HatAlberta
    26
  63. 61MonctonNew Brunswick
    26
  64. 61Rouyn-NorandaQuebec
    26
  65. 65ChilliwackBritish Columbia
    26
  66. 65FrederictonNew Brunswick
    26
  67. 65Swift CurrentSaskatchewan
    26
  68. 68KamloopsBritish Columbia
    24
  69. 69Saint JohnNew Brunswick
    23
  70. 70Port CoquitlamBritish Columbia
    23
  71. 71Fort St. JohnBritish Columbia
    22
  72. 72CoquitlamBritish Columbia
    22
  73. 73DartmouthNova Scotia
    21
  74. 74Sherwood ParkAlberta
    19
  75. 75KelownaBritish Columbia
    18
  76. 75West VancouverBritish Columbia
    18
  77. 77Fort McMurrayAlberta
    18
  78. 78CharlottetownPrince Edward Island
    16
  79. 78SquamishBritish Columbia
    16
  80. 80Grande PrairieAlberta
    15
  81. 81St. AlbertAlberta
    14
  82. 82Prince AlbertSaskatchewan
    14
  83. 83SydneyNova Scotia
    13
  84. 84MiltonOntario
    9
  85. 85Winnipeglow-cost sensorsManitoba
    1
  86. 86Yellowknifelow-cost sensorsNorthwest Territories
    0
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, October 2026 · Canada now

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SmogRank, most polluted cities in Canada, PM2.5, October 2026 (so far), smogrank.com/ca/history/2026-10 (accessed 2 Oct 2026).

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