SmogRank / History / City race

Cities in United States, 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 30 days to11 Jun 2026 That day's board

The worst cities in United States for PM2.5 over the 30 days to 11 Jun 2026: Jurupa Valley 15.9 µg/m³, Riverside 14.3 µg/m³ and Wake Forest 12.8 µg/m³.

  1. 1Jurupa ValleyCalifornia15.9
  2. 2RiversideCalifornia14.3
  3. 3Wake ForestNorth Carolina12.8
  4. 4Imperial BeachCalifornia12.8
  5. 5Los AngelesCalifornia12.8
  6. 6Santa MonicaCalifornia12.7
  7. 7WhittierCalifornia12.5
  8. 8LaredoTexas12.3
  9. 9ComptonCalifornia12.1
  10. 10FontanaCalifornia12.0
  11. 11ChattanoogaTennessee11.5
  12. 12El CajonCalifornia11.2
  13. 13ShreveportLouisiana11.1
  14. 14San DiegoCalifornia11.1
  15. 15Eagle PassTexas11.1
  16. 16Mission ViejoCalifornia11.0
  17. 17AustinTexas10.9
  18. 18MissionTexas10.9
  19. 19AnaheimCalifornia10.9
  20. 20PowayCalifornia10.9

+ 835 more cities, 10.8 µg/m³ and below

Not counted on this day, too few days measured: Mecca since 1 Jun 2026, Rio Vista since 9 May 2026, Carson since 16 Apr 2026 and 2 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.