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.

CountriesCities
The 7 days to7 Aug 2026 That day's board

The worst cities for PM2.5 over the 7 days to 7 Aug 2026: Coyhaique 103.0 µg/m³, Wenatchee 97.6 µg/m³ and Prineville 92.5 µg/m³.

  1. 1CoyhaiqueChile103.0
  2. 2WenatcheeUnited States97.6
  3. 3PrinevilleUnited States92.5
  4. 4KinshasaDemocratic Republic of the Congo79.9
  5. 5KamloopsCanada78.9
  6. 6QuincyUnited States68.2
  7. 7Union GapUnited States66.0
  8. 8GurugramIndia63.2
  9. 9FairwoodUnited States63.2
  10. 10KampalaUganda61.5
  11. 11LilongweMalawi60.4
  12. 12BeitbridgeZimbabwe57.9
  13. 13CheneyUnited States57.4
  14. 14WeiserUnited States57.3
  15. 15FaisalabadPakistan56.1
  16. 16MeadUnited States55.9
  17. 17EphrataUnited States55.8
  18. 18Airway HeightsUnited States55.6
  19. 19HopeCanada55.6
  20. 20GobindgarhIndia55.6

+ 3,011 more cities, 55.3 µg/m³ and below

Not counted on this day, too few days measured: Pāli since 6 Aug 2026, Chāpra since 5 Aug 2026, Ropar since 1 Aug 2026 and 4 more cities.

30 days7 days
GoodModerateSensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that 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.