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 18 Dec 2024: Calgary 12.5 µg/m³, Edmonton 11.5 µg/m³ and Drayton Valley 10.3 µg/m³.
- 1CalgaryAlberta12.5
- 2EdmontonAlberta11.5
- 3Drayton ValleyAlberta10.3
- 4CranbrookBritish Columbia9.5
- 5Red DeerAlberta9.5
- 6EdsonAlberta9.3
- 7Fort SaskatchewanAlberta9.2
- 8LethbridgeAlberta9.2
- 9AirdrieAlberta9.1
- 10Port AlberniBritish Columbia9.0
- 11Sherwood ParkAlberta8.9
- 12WindsorOntario8.8
- 13VernonBritish Columbia8.5
- 14Prince GeorgeBritish Columbia8.3
- 15QuesnelBritish Columbia8.3
- 16St. AlbertAlberta8.2
- 17KamloopsBritish Columbia7.8
- 18TerraceBritish Columbia7.7
- 19Medicine HatAlberta7.5
- 20Grande PrairieAlberta7.4
+ 93 more cities, the next at 7.0 µg/m³
Not counted on this day, too few days measured: Harewood since 17 Dec 2024, 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 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.