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 to25 Sep 2023 That day's board

The worst cities in Canada for PM2.5 over the 30 days to 25 Sep 2023: Fort McMurray 66.3 µg/m³, Grande Prairie 55.9 µg/m³ and Prince Albert 51.4 µg/m³.

  1. 1Fort McMurrayAlberta66.3
  2. 2Grande PrairieAlberta55.9
  3. 3Prince AlbertSaskatchewan51.4
  4. 4EdmontonAlberta50.7
  5. 5Grand CentreAlberta47.4
  6. 6Fort St. JohnBritish Columbia47.3
  7. 7SaskatoonSaskatchewan45.7
  8. 8ReginaSaskatchewan45.5
  9. 9Fort SaskatchewanAlberta41.3
  10. 10QuesnelBritish Columbia36.9
  11. 11EstevanSaskatchewan34.5
  12. 12Prince GeorgeBritish Columbia33.6
  13. 13Swift CurrentSaskatchewan29.8
  14. 14Red DeerAlberta28.8
  15. 15Flin FlonManitoba28.5
  16. 16St. AlbertAlberta27.7
  17. 17Sherwood ParkAlberta26.7
  18. 18Drayton ValleyAlberta25.2
  19. 19EdsonAlberta23.7
  20. 20CalgaryAlberta22.6

+ 96 more cities, the next at 19.1 µg/m³

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 reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.