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 Apr 2024 That day's board

The worst cities in Canada for PM2.5 over the 30 days to 15 Apr 2024: Regina 8.5 µg/m³, Smithers 8.5 µg/m³ and Calgary 8.4 µg/m³.

  1. 1ReginaSaskatchewan8.5
  2. 2SmithersBritish Columbia8.5
  3. 3CalgaryAlberta8.4
  4. 4Prince GeorgeBritish Columbia7.8
  5. 5EstevanSaskatchewan7.4
  6. 6SaskatoonSaskatchewan7.4
  7. 7Fort SaskatchewanAlberta7.3
  8. 8DuncanBritish Columbia7.1
  9. 9Red DeerAlberta7.0
  10. 10QuesnelBritish Columbia6.8
  11. 11VernonBritish Columbia6.6
  12. 12ChilliwackBritish Columbia6.4
  13. 13SaguenayQuebec6.2
  14. 14SquamishBritish Columbia6.0
  15. 15CastlegarBritish Columbia5.9
  16. 16KamloopsBritish Columbia5.9
  17. 17LangfordBritish Columbia5.9
  18. 18EdmontonAlberta5.8
  19. 19Prince AlbertSaskatchewan5.7
  20. 20WindsorOntario5.7

+ 92 more cities, 5.6 µg/m³ and below

Not counted on this day, too few days measured: St. Thomas since 10 Apr 2024 and Bécancour since 28 Mar 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.