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 Jul 2024: Fort McMurray 30.4 µg/m³, Prince Albert 17.4 µg/m³ and Saskatoon 13.9 µg/m³.
- 1Fort McMurrayAlberta30.4
- 2Prince AlbertSaskatchewan17.4
- 3SaskatoonSaskatchewan13.9
- 4Grand CentreAlberta13.6
- 5NepeanOntario13.3
- 6EstevanSaskatchewan13.0
- 7ReginaSaskatchewan11.6
- 8Flin FlonManitoba11.4
- 9Fort St. JohnBritish Columbia10.0
- 10CalgaryAlberta9.1
- 11SaguenayQuebec9.0
- 12QuesnelBritish Columbia8.9
- 13Grande PrairieAlberta8.8
- 14EdmontonAlberta8.7
- 15Swift CurrentSaskatchewan8.7
- 16WindsorOntario8.5
- 17Red DeerAlberta8.2
- 18Sorel-TracyQuebec8.2
- 19Fort SaskatchewanAlberta8.1
- 20BarrieOntario8.0
+ 92 more cities, 7.9 µg/m³ and below
Not counted on this day, too few days measured: Kitchener since 3 Jul 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 readers for them. Most cities there are missing from this board, not clean. Why.