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 to22 Sep 2023 That day's board

The worst cities in Canada for PM2.5 over the 30 days to 22 Sep 2023: Fort McMurray 72.4 µg/m³, Grande Prairie 59.8 µg/m³ and Edmonton 54.2 µg/m³.

  1. 1Fort McMurrayAlberta72.4
  2. 2Grande PrairieAlberta59.8
  3. 3EdmontonAlberta54.2
  4. 4Prince AlbertSaskatchewan51.2
  5. 5Grand CentreAlberta48.2
  6. 6Fort St. JohnBritish Columbia47.6
  7. 7SaskatoonSaskatchewan45.7
  8. 8ReginaSaskatchewan45.5
  9. 9Fort SaskatchewanAlberta44.3
  10. 10QuesnelBritish Columbia39.4
  11. 11Prince GeorgeBritish Columbia37.4
  12. 12EstevanSaskatchewan35.2
  13. 13St. AlbertAlberta30.2
  14. 14Flin FlonManitoba30.1
  15. 15Red DeerAlberta29.8
  16. 16Swift CurrentSaskatchewan29.6
  17. 17Sherwood ParkAlberta28.8
  18. 18Drayton ValleyAlberta26.5
  19. 19EdsonAlberta24.8
  20. 20CalgaryAlberta23.5

+ 100 more cities, 21.3 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.