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 to14 Apr 2025 That day's board

The worst cities in United States for PM2.5 over the 30 days to 14 Apr 2025: El Paso 27.1 µg/m³, Sunland Park 25.5 µg/m³ and Socorro 19.4 µg/m³.

  1. 1El PasoTexas27.1
  2. 2Sunland ParkNew Mexico25.5
  3. 3SocorroTexas19.4
  4. 4AnthonyNew Mexico18.6
  5. 5HobbsNew Mexico15.5
  6. 6Santa MonicaCalifornia15.3
  7. 7ColumbusGeorgia15.0
  8. 8EdinburgTexas13.0
  9. 9Corpus ChristiTexas12.7
  10. 10BirminghamAlabama12.6
  11. 11MissionTexas12.3
  12. 12Port IsabelTexas12.3
  13. 13ConroeTexas12.2
  14. 14Imperial BeachCalifornia12.2
  15. 15AlbanyGeorgia12.1
  16. 16Las CrucesNew Mexico11.9
  17. 17MaconGeorgia11.8
  18. 18OdessaTexas11.8
  19. 19WindcrestTexas11.7
  20. 20HoustonTexas11.6

+ 828 more cities, 11.3 µg/m³ and below

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.