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 to15 Dec 2024 That day's board

The worst cities in Canada for PM2.5 over the 30 days to 15 Dec 2024: Edmonton 11.7 µg/m³, Calgary 11.0 µg/m³ and Drayton Valley 10.1 µg/m³.

  1. 1EdmontonAlberta11.7
  2. 2CalgaryAlberta11.0
  3. 3Drayton ValleyAlberta10.1
  4. 4Fort SaskatchewanAlberta9.4
  5. 5Red DeerAlberta9.3
  6. 6CranbrookBritish Columbia8.9
  7. 7WindsorOntario8.9
  8. 8Sherwood ParkAlberta8.8
  9. 9EdsonAlberta8.7
  10. 10Port AlberniBritish Columbia8.7
  11. 11St. AlbertAlberta8.4
  12. 12VernonBritish Columbia8.4
  13. 13HarewoodBritish Columbia8.4
  14. 14Prince GeorgeBritish Columbia8.1
  15. 15QuesnelBritish Columbia8.1
  16. 16AirdrieAlberta8.0
  17. 17KamloopsBritish Columbia7.9
  18. 18LethbridgeAlberta7.9
  19. 19TerraceBritish Columbia7.5
  20. 20Grande PrairieAlberta7.2

+ 94 more cities, 7.1 µg/m³ and below

Not counted on this day, too few days measured: Creston since 23 Nov 2024, Penticton since 30 Oct 2024 and Courtenay since 27 Oct 2024.

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.