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 Nov 2024: Cranbrook 10.1 µg/m³, Castlegar 9.4 µg/m³ and Edmonton 9.3 µg/m³.
- 1CranbrookBritish Columbia10.1
- 2CastlegarBritish Columbia9.4
- 3EdmontonAlberta9.3
- 4VernonBritish Columbia8.9
- 5CrestonBritish Columbia8.7
- 6WindsorOntario8.5
- 7BarrieOntario7.5
- 8Prince GeorgeBritish Columbia7.5
- 9Red DeerAlberta7.5
- 10CalgaryAlberta7.4
- 11Fort SaskatchewanAlberta7.4
- 12SarniaOntario7.4
- 13Port AlberniBritish Columbia7.1
- 14KelownaBritish Columbia6.9
- 15Drayton ValleyAlberta6.8
- 16NepeanOntario6.8
- 17HarewoodBritish Columbia6.8
- 18Sherwood ParkAlberta6.7
- 19TorontoOntario6.7
- 20BrantfordOntario6.6
+ 96 more cities, the next at 6.6 µg/m³
Not counted on this day, too few days measured: Penticton since 30 Oct 2024, Courtenay since 27 Oct 2024, Flin Flon since 1 Oct 2024 and Thunder Bay since 27 Sep 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.