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 21 Nov 2023: Cranbrook 14.4 µg/m³, Quesnel 12.2 µg/m³ and Regina 12.1 µg/m³.
- 1CranbrookBritish Columbia14.4
- 2QuesnelBritish Columbia12.2
- 3ReginaSaskatchewan12.1
- 4VernonBritish Columbia11.7
- 5CastlegarBritish Columbia11.6
- 6SmithersBritish Columbia11.6
- 7EdmontonAlberta11.5
- 8DuncanBritish Columbia10.6
- 9CourtenayBritish Columbia9.7
- 10Port AlberniBritish Columbia9.7
- 11WindsorOntario9.7
- 12Fort SaskatchewanAlberta9.6
- 13CalgaryAlberta9.5
- 14KamloopsBritish Columbia9.5
- 15HarewoodBritish Columbia9.4
- 16Grande PrairieAlberta9.2
- 17TerraceBritish Columbia8.6
- 18LangfordBritish Columbia8.5
- 19LondonOntario8.3
- 20SarniaOntario8.3
+ 96 more cities, 8.2 µg/m³ and below
Not counted on this day, too few days measured: Prince George since 19 Nov 2023, Creston since 11 Nov 2023, Bécancour since 29 Oct 2023 and Flin Flon since 11 Oct 2023.
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.