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 20 Aug 2024: Fort McMurray 42.5 µg/m³, Flin Flon 33.6 µg/m³ and Fort Saskatchewan 33.5 µg/m³.
- 1Fort McMurrayAlberta42.5
- 2Flin FlonManitoba33.6
- 3Fort SaskatchewanAlberta33.5
- 4EdmontonAlberta33.1
- 5Grand CentreAlberta32.4
- 6Prince AlbertSaskatchewan31.4
- 7SaskatoonSaskatchewan30.6
- 8CalgaryAlberta27.0
- 9EstevanSaskatchewan26.1
- 10ReginaSaskatchewan24.2
- 11Drayton ValleyAlberta24.0
- 12Swift CurrentSaskatchewan23.8
- 13AirdrieAlberta22.0
- 14St. AlbertAlberta21.9
- 15Grande PrairieAlberta21.8
- 16Red DeerAlberta21.7
- 17Sherwood ParkAlberta21.5
- 18Medicine HatAlberta20.3
- 19NepeanOntario17.7
- 20CastlegarBritish Columbia17.1
+ 98 more cities, the next at 16.1 µg/m³
Not counted on this day, too few days measured: Rouyn-Noranda since 16 Aug 2024 and Fort St. John since 6 Aug 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.