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 Jul 2024: Fort McMurray 48.8 µg/m³, Grand Centre 30.4 µg/m³ and Fort St. John 28.5 µg/m³.
- 1Fort McMurrayAlberta48.8
- 2Grand CentreAlberta30.4
- 3Fort St. JohnBritish Columbia28.5
- 4Prince AlbertSaskatchewan27.1
- 5SaskatoonSaskatchewan20.6
- 6EdmontonAlberta16.9
- 7Flin FlonManitoba16.4
- 8Fort SaskatchewanAlberta16.2
- 9EstevanSaskatchewan15.6
- 10ReginaSaskatchewan14.6
- 11St. AlbertAlberta13.5
- 12NepeanOntario12.3
- 13Grande PrairieAlberta11.2
- 14CalgaryAlberta10.8
- 15Drayton ValleyAlberta10.7
- 16EdsonAlberta10.3
- 17Red DeerAlberta10.3
- 18Swift CurrentSaskatchewan10.2
- 19QuesnelBritish Columbia9.9
- 20Medicine HatAlberta9.8
+ 93 more cities, the next at 9.1 µg/m³
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 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.