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 Oct 2023: Fort McMurray 17.3 µg/m³, Fort St. John 14.2 µg/m³ and Regina 13.2 µg/m³.
- 1Fort McMurrayAlberta17.3
- 2Fort St. JohnBritish Columbia14.2
- 3ReginaSaskatchewan13.2
- 4Grande PrairieAlberta12.9
- 5EdmontonAlberta11.6
- 6Prince AlbertSaskatchewan11.1
- 7Grand CentreAlberta10.7
- 8L'Ancienne-LoretteQuebec10.0
- 9GranbyQuebec9.9
- 10St. John'sNewfoundland and Labrador9.9
- 11EstevanSaskatchewan9.6
- 12SaskatoonSaskatchewan9.4
- 13CornwallOntario9.3
- 14Fort SaskatchewanAlberta9.3
- 15Rivière-des-Prairies–Pointe-aux-TremblesQuebec9.3
- 16MontréalQuebec9.2
- 17LondonOntario9.1
- 18SherbrookeQuebec9.0
- 19QuébecQuebec9.0
- 20OakvilleOntario8.9
+ 96 more cities, 8.8 µg/m³ and below
Not counted on this day, too few days measured: Saint-Jean-sur-Richelieu since 12 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.