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 9 Aug 2026: Prineville 111.5 µg/m³, Kamloops 107.9 µg/m³ and Coyhaique 103.4 µg/m³.
- 1PrinevilleUnited States111.5
- 2KamloopsCanada107.9
- 3CoyhaiqueChile103.4
- 4WenatcheeUnited States99.7
- 5QuincyUnited States82.9
- 6KinshasaDemocratic Republic of the Congo77.1
- 7EphrataUnited States73.8
- 8VernonCanada69.6
- 9CastlegarCanada68.3
- 10LilongweMalawi67.7
- 11KampalaUganda67.0
- 12MeadUnited States66.6
- 13Moses LakeUnited States64.9
- 14Spokane ValleyUnited States64.3
- 15FairwoodUnited States64.1
- 16Airway HeightsUnited States64.0
- 17SpokaneUnited States62.2
- 18WeiserUnited States61.1
- 19HualpénChile59.9
- 20Charkhi DādriIndia59.5
+ 3,026 more cities, 59.3 µg/m³ and below
Not counted on this day, too few days measured: Pāli since 6 Aug 2026, Chāpra since 5 Aug 2026, Rājgīr since 31 Jul 2026 and 2 more cities.
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.