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 to18 Mar 2025 That day's board

The worst cities in United States for PM2.5 over the 30 days to 18 Mar 2025: Sunland Park 32.0 µg/m³, Anthony 27.3 µg/m³ and Socorro 23.0 µg/m³.

  1. 1Sunland ParkNew Mexico32.0
  2. 2AnthonyNew Mexico27.3
  3. 3SocorroTexas23.0
  4. 4ConwaySouth Carolina16.2
  5. 5Red HillSouth Carolina16.2
  6. 6MaconGeorgia15.6
  7. 7AugustaGeorgia15.2
  8. 8FairviewGeorgia15.2
  9. 9East RidgeTennessee15.2
  10. 10ColumbusGeorgia14.9
  11. 11AlbanyGeorgia14.8
  12. 12OdessaTexas14.3
  13. 13Las CrucesNew Mexico14.2
  14. 14Imperial BeachCalifornia14.0
  15. 15McAlesterOklahoma13.9
  16. 16BirminghamAlabama13.6
  17. 17Port IsabelTexas13.3
  18. 18TallahasseeFlorida13.0
  19. 19Santa MonicaCalifornia13.0
  20. 20Warner RobinsGeorgia12.8

+ 814 more cities, the next at 12.3 µg/m³

Not counted on this day, too few days measured: Port Arthur since 26 Feb 2025.

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 reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.