SmogRank / History / City race

Cities in Canada, worst air first, day by day

Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.

CountriesCities
The 30 days to14 Sep 2025 That day's board

The worst cities in Canada for PM2.5 over the 30 days to 14 Sep 2025: Grande Prairie 31.8 µg/m³, Edmonton 27.3 µg/m³ and Fort McMurray 27.3 µg/m³.

  1. 1Grande PrairieAlberta31.8
  2. 2EdmontonAlberta27.3
  3. 3Fort McMurrayAlberta27.3
  4. 4Prince GeorgeBritish Columbia25.5
  5. 5Fort SaskatchewanAlberta25.4
  6. 6St. AlbertAlberta22.4
  7. 7QuesnelBritish Columbia21.9
  8. 8CalgaryAlberta21.5
  9. 9Sherwood ParkAlberta21.1
  10. 10Williams LakeBritish Columbia20.8
  11. 11EdsonAlberta20.7
  12. 12Fort St. JohnBritish Columbia20.2
  13. 13SquamishBritish Columbia19.0
  14. 14Red DeerAlberta18.7
  15. 15LethbridgeAlberta18.6
  16. 16CastlegarBritish Columbia18.5
  17. 17Drayton ValleyAlberta17.2
  18. 18Grand CentreAlberta16.4
  19. 19HopeBritish Columbia15.0
  20. 20CranbrookBritish Columbia14.4

+ 97 more cities, 14.2 µg/m³ and below

Not counted on this day, too few days measured: Flin Flon since 23 Aug 2025.

30 days7 days
GoodModerateSensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that day

A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.

Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.