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 to19 Aug 2023 That day's board

The worst cities in Canada for PM2.5 over the 30 days to 19 Aug 2023: Vernon 26.9 µg/m³, Fort McMurray 26.1 µg/m³ and Prince Albert 23.6 µg/m³.

  1. 1VernonBritish Columbia26.9
  2. 2Fort McMurrayAlberta26.1
  3. 3Prince AlbertSaskatchewan23.6
  4. 4KamloopsBritish Columbia23.5
  5. 5KelownaBritish Columbia20.8
  6. 6CastlegarBritish Columbia20.4
  7. 7SaskatoonSaskatchewan19.9
  8. 8CranbrookBritish Columbia19.5
  9. 9Grand CentreAlberta19.3
  10. 10EdmontonAlberta19.0
  11. 11ReginaSaskatchewan18.1
  12. 12PentictonBritish Columbia17.9
  13. 13Swift CurrentSaskatchewan17.3
  14. 14EstevanSaskatchewan17.0
  15. 15QuesnelBritish Columbia16.7
  16. 16CrestonBritish Columbia15.6
  17. 17Greater SudburyOntario14.8
  18. 18CalgaryAlberta14.7
  19. 19LondonOntario14.7
  20. 20WindsorOntario14.5

+ 92 more cities, 14.4 µg/m³ and below

Not counted on this day, too few days measured: Flin Flon since 7 Aug 2023 and Bécancour since 15 Jul 2023.

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.