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 to18 Sep 2023 That day's board

The worst cities in Canada for PM2.5 over the 30 days to 18 Sep 2023: Fort McMurray 69.0 µg/m³, Grande Prairie 57.3 µg/m³ and Edmonton 54.7 µg/m³.

  1. 1Fort McMurrayAlberta69.0
  2. 2Grande PrairieAlberta57.3
  3. 3EdmontonAlberta54.7
  4. 4Prince AlbertSaskatchewan49.9
  5. 5Fort St. JohnBritish Columbia49.0
  6. 6KamloopsBritish Columbia49.0
  7. 7Grand CentreAlberta47.1
  8. 8Fort SaskatchewanAlberta44.6
  9. 9SaskatoonSaskatchewan44.3
  10. 10ReginaSaskatchewan43.0
  11. 11QuesnelBritish Columbia42.4
  12. 12Prince GeorgeBritish Columbia38.0
  13. 13EstevanSaskatchewan33.1
  14. 14Flin FlonManitoba30.9
  15. 15PentictonBritish Columbia30.7
  16. 16St. AlbertAlberta30.6
  17. 17Red DeerAlberta30.3
  18. 18Swift CurrentSaskatchewan30.2
  19. 19Sherwood ParkAlberta29.0
  20. 20KelownaBritish Columbia27.9

+ 100 more cities, 27.0 µg/m³ and below

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.