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.
The worst cities in Canada for PM2.5 over the 30 days to 11 Dec 2024: Edmonton 10.8 µg/m³, Calgary 10.3 µg/m³ and Cranbrook 8.6 µg/m³.
- 1EdmontonAlberta10.8
- 2CalgaryAlberta10.3
- 3CranbrookBritish Columbia8.6
- 4Drayton ValleyAlberta8.6
- 5Fort SaskatchewanAlberta8.6
- 6Red DeerAlberta8.5
- 7WindsorOntario8.4
- 8VernonBritish Columbia8.3
- 9Port AlberniBritish Columbia8.2
- 10Sherwood ParkAlberta8.2
- 11KamloopsBritish Columbia7.9
- 12HarewoodBritish Columbia7.8
- 13Prince GeorgeBritish Columbia7.6
- 14AirdrieAlberta7.5
- 15EdsonAlberta7.5
- 16QuesnelBritish Columbia7.5
- 17LethbridgeAlberta7.4
- 18St. AlbertAlberta7.2
- 19DuncanBritish Columbia6.9
- 20CastlegarBritish Columbia6.8
+ 94 more cities, 6.8 µg/m³ and below
Not counted on this day, too few days measured: Creston since 23 Nov 2024, Penticton since 30 Oct 2024 and Courtenay since 27 Oct 2024.
Cities counted each 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.