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 to15 Mar 2025 That day's board

The worst cities in United States for PM2.5 over the 30 days to 15 Mar 2025: Sunland Park 25.0 µg/m³, Anthony 21.5 µg/m³ and Socorro 21.2 µg/m³.

  1. 1Sunland ParkNew Mexico25.0
  2. 2AnthonyNew Mexico21.5
  3. 3SocorroTexas21.2
  4. 4ConwaySouth Carolina16.1
  5. 5Red HillSouth Carolina16.1
  6. 6AugustaGeorgia15.3
  7. 7FairviewGeorgia15.2
  8. 8East RidgeTennessee15.2
  9. 9MaconGeorgia14.8
  10. 10ColumbusGeorgia14.6
  11. 11McAlesterOklahoma14.6
  12. 12AlbanyGeorgia14.5
  13. 13Imperial BeachCalifornia14.1
  14. 14RedfordMichigan13.4
  15. 15Port IsabelTexas13.3
  16. 16BirminghamAlabama13.2
  17. 17TallahasseeFlorida12.7
  18. 18Warner RobinsGeorgia12.5
  19. 19HoustonTexas12.5
  20. 20ColumbiaMissouri12.3

+ 810 more cities, 12.2 µg/m³ and below

Not counted on this day, too few days measured: Nogales since 7 Mar 2025 and 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 readers for them. Most cities there are missing from this board, not clean. Why.