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 to5 May 2026 That day's board

The worst cities in United States for PM2.5 over the 30 days to 5 May 2026: Rio Vista 18.4 µg/m³, Macon 15.7 µg/m³ and Laredo 15.0 µg/m³.

  1. 1Rio VistaCalifornia18.4
  2. 2MaconGeorgia15.7
  3. 3LaredoTexas15.0
  4. 4El PasoTexas15.0
  5. 5Port ArthurTexas13.8
  6. 6Jurupa ValleyCalifornia12.7
  7. 7Eagle PassTexas12.7
  8. 8ValdostaGeorgia12.5
  9. 9AustinTexas12.5
  10. 10Corpus ChristiTexas12.5
  11. 11AugustaGeorgia12.2
  12. 12MissionTexas12.2
  13. 13BrunswickGeorgia11.8
  14. 14Port IsabelTexas11.7
  15. 15SavannahGeorgia11.6
  16. 16Wake ForestNorth Carolina11.4
  17. 17EdinburgTexas11.4
  18. 18San AntonioTexas11.3
  19. 19Warner RobinsGeorgia10.9
  20. 20Lake CityFlorida10.8

+ 847 more cities, 10.8 µg/m³ and below

Not counted on this day, too few days measured: Helotes since 2 May 2026, Carson since 16 Apr 2026, Hawthorne 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.