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 to2 Oct 2026 That day's board

The worst cities in Canada for PM2.5 over the 30 days to 2 Oct 2026: Kamloops 7.7 µg/m³, Castlegar 7.5 µg/m³ and Chilliwack 7.5 µg/m³.

  1. 1KamloopsBritish Columbia7.7
  2. 2CastlegarBritish Columbia7.5
  3. 3ChilliwackBritish Columbia7.5
  4. 4EdmontonAlberta7.5
  5. 5HopeBritish Columbia7.5
  6. 6AgassizBritish Columbia7.3
  7. 7Red DeerAlberta7.0
  8. 8AbbotsfordBritish Columbia6.9
  9. 9Prince GeorgeBritish Columbia6.9
  10. 10VernonBritish Columbia6.9
  11. 11CalgaryAlberta6.8
  12. 12QuesnelBritish Columbia6.7
  13. 13Fort SaskatchewanAlberta6.4
  14. 14Sorel-TracyQuebec6.3
  15. 15HarewoodBritish Columbia6.3
  16. 16Drayton ValleyAlberta6.1
  17. 17L'Ancienne-LoretteQuebec6.1
  18. 18SquamishBritish Columbia6.0
  19. 19VictoriaBritish Columbia6.0
  20. 20Strawberry HillBritish Columbia5.9

+ 98 more cities, 5.9 µg/m³ and below

Not counted on this day, too few days measured: Prince Albert since 25 Sep 2026.

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.