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 16 Feb 2025: Prince George 13.0 µg/m³, Port Alberni 12.5 µg/m³ and Quesnel 12.1 µg/m³.
- 1Prince GeorgeBritish Columbia13.0
- 2Port AlberniBritish Columbia12.5
- 3QuesnelBritish Columbia12.1
- 4L'Ancienne-LoretteQuebec10.9
- 5CranbrookBritish Columbia10.2
- 6DuncanBritish Columbia10.0
- 7Sorel-TracyQuebec9.8
- 8SmithersBritish Columbia9.4
- 9VernonBritish Columbia9.4
- 10WindsorOntario9.3
- 11KamloopsBritish Columbia9.0
- 12BécancourQuebec8.9
- 13CalgaryAlberta8.9
- 14EdmontonAlberta8.7
- 15Sherwood ParkAlberta8.6
- 16QuébecQuebec8.3
- 17LangfordBritish Columbia8.1
- 18Fort SaskatchewanAlberta7.9
- 19Trois-RivièresQuebec7.9
- 20ShawiniganQuebec7.7
+ 92 more cities, the next at 7.6 µg/m³
Not counted on this day, too few days measured: Brooklin since 24 Jan 2025, Gatineau since 19 Jan 2025 and Nepean since 19 Jan 2025.
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.