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 23 Aug 2023: Kamloops 51.1 µg/m³, Vernon 40.0 µg/m³ and Kelowna 37.3 µg/m³.
- 1KamloopsBritish Columbia51.1
- 2VernonBritish Columbia40.0
- 3KelownaBritish Columbia37.3
- 4PentictonBritish Columbia36.4
- 5CastlegarBritish Columbia29.1
- 6CranbrookBritish Columbia23.1
- 7Fort McMurrayAlberta21.7
- 8Prince AlbertSaskatchewan21.4
- 9CrestonBritish Columbia19.7
- 10QuesnelBritish Columbia18.0
- 11HopeBritish Columbia17.3
- 12SaskatoonSaskatchewan16.6
- 13ReginaSaskatchewan16.5
- 14Swift CurrentSaskatchewan16.4
- 15EdmontonAlberta15.6
- 16Grand CentreAlberta15.6
- 17EstevanSaskatchewan15.4
- 18Greater SudburyOntario15.2
- 19CalgaryAlberta15.0
- 20LondonOntario15.0
+ 92 more cities, 14.7 µg/m³ and below
Not counted on this day, too few days measured: Flin Flon since 7 Aug 2023 and Bécancour since 15 Jul 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.