SmogRank / History / City race
Cities, 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 for PM2.5 over the 7 days to 26 Aug 2023: Kamloops 140.2 µg/m³, Osorno 92.5 µg/m³ and Penticton 90.9 µg/m³.
- 1KamloopsCanada140.2
- 2OsornoChile92.5
- 3PentictonCanada90.9
- 4Puerto VarasChile89.4
- 5AshlandUnited States89.4
- 6MedfordUnited States86.8
- 7Grants PassUnited States86.0
- 8TalentUnited States82.4
- 9RedmondUnited States81.6
- 10KelownaCanada79.6
- 11ManamaBahrain75.9
- 12Walla WallaUnited States72.5
- 13EphrataUnited States70.2
- 14Tri-CitiesUnited States67.1
- 15HermistonUnited States66.9
- 16VernonCanada64.2
- 17HopeCanada63.0
- 18Moses LakeUnited States62.8
- 19Ash ShīḩānīyahQatar61.5
- 20MadrasUnited States61.2
+ 1,913 more cities, 60.3 µg/m³ and below
Not counted on this day, too few days measured: Ceglie Messapica since 28 Jul 2023, Laja since 27 Jul 2023 and Hualpén since 26 Jul 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.