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 25 Oct 2023: Fort McMurray 11.4 µg/m³, L'Ancienne-Lorette 9.9 µg/m³ and Edmonton 9.8 µg/m³.
- 1Fort McMurrayAlberta11.4
- 2L'Ancienne-LoretteQuebec9.9
- 3EdmontonAlberta9.8
- 4St. John'sNewfoundland and Labrador9.8
- 5Grande PrairieAlberta9.0
- 6GranbyQuebec8.8
- 7QuébecQuebec8.8
- 8BécancourQuebec8.5
- 9Rivière-des-Prairies–Pointe-aux-TremblesQuebec8.5
- 10LondonOntario8.4
- 11ReginaSaskatchewan8.4
- 12EdmundstonNew Brunswick8.4
- 13MontréalQuebec8.3
- 14Fort SaskatchewanAlberta8.2
- 15Fort St. JohnBritish Columbia8.2
- 16SaguenayQuebec8.2
- 17WindsorOntario8.2
- 18BrantfordOntario8.0
- 19OakvilleOntario8.0
- 20CornwallOntario7.8
+ 96 more cities, the next at 7.8 µg/m³
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 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.