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 to8 Jun 2026 That day's board

The worst cities in United States for PM2.5 over the 30 days to 8 Jun 2026: Jurupa Valley 16.0 µg/m³, Riverside 14.6 µg/m³ and Santa Monica 13.1 µg/m³.

  1. 1Jurupa ValleyCalifornia16.0
  2. 2RiversideCalifornia14.6
  3. 3Santa MonicaCalifornia13.1
  4. 4Los AngelesCalifornia13.0
  5. 5WhittierCalifornia13.0
  6. 6Imperial BeachCalifornia12.8
  7. 7ComptonCalifornia12.3
  8. 8Wake ForestNorth Carolina12.1
  9. 9LaredoTexas12.1
  10. 10FontanaCalifornia12.0
  11. 11El CajonCalifornia11.3
  12. 12ChattanoogaTennessee11.2
  13. 13San DiegoCalifornia11.1
  14. 14MissionTexas11.0
  15. 15AnaheimCalifornia11.0
  16. 16BurbankCalifornia11.0
  17. 17Mission ViejoCalifornia11.0
  18. 18ShreveportLouisiana10.9
  19. 19AustinTexas10.9
  20. 20PowayCalifornia10.9

+ 839 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.