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 to7 Oct 2025 That day's board

The worst cities in Canada for PM2.5 over the 30 days to 7 Oct 2025: Fort McMurray 19.5 µg/m³, Edmonton 17.8 µg/m³ and Castlegar 15.5 µg/m³.

  1. 1Fort McMurrayAlberta19.5
  2. 2EdmontonAlberta17.8
  3. 3CastlegarBritish Columbia15.5
  4. 4Fort SaskatchewanAlberta15.3
  5. 5QuesnelBritish Columbia14.6
  6. 6CalgaryAlberta14.3
  7. 7St. AlbertAlberta13.5
  8. 8EstevanSaskatchewan13.2
  9. 9Sherwood ParkAlberta13.2
  10. 10Red DeerAlberta13.1
  11. 11SaskatoonSaskatchewan13.1
  12. 12Prince AlbertSaskatchewan12.7
  13. 13Prince GeorgeBritish Columbia12.3
  14. 14CranbrookBritish Columbia12.2
  15. 15Grande PrairieAlberta12.1
  16. 16WindsorOntario11.9
  17. 17EdsonAlberta11.3
  18. 18CrestonBritish Columbia10.9
  19. 19LethbridgeAlberta10.9
  20. 20Grand CentreAlberta10.7

+ 93 more cities, 10.4 µg/m³ and below

Not counted on this day, too few days measured: Williams Lake since 4 Oct 2025 and 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.