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 to28 Apr 2023 That day's board

The worst cities in United States for PM2.5 over the 30 days to 28 Apr 2023: New Holland 15.2 µg/m³, Los Angeles 14.7 µg/m³ and Port Isabel 14.4 µg/m³.

  1. 1New HollandPennsylvania15.2
  2. 2Los AngelesCalifornia14.7
  3. 3Port IsabelTexas14.4
  4. 4RedfordMichigan14.4
  5. 5IndianapolisIndiana14.1
  6. 6Jurupa ValleyCalifornia12.6
  7. 7ComptonCalifornia12.5
  8. 8Beaver FallsPennsylvania12.3
  9. 9FairfieldAlabama12.2
  10. 10HueytownAlabama12.2
  11. 11San DiegoCalifornia12.2
  12. 12BirminghamAlabama12.0
  13. 13EdinburgTexas11.9
  14. 14DetroitMichigan11.8
  15. 15FairviewGeorgia11.7
  16. 16TulsaOklahoma11.7
  17. 17BurbankCalifornia11.7
  18. 18MiamiOklahoma11.6
  19. 19TopekaKansas11.5
  20. 20Valley StationKentucky11.5

+ 663 more cities, the next at 11.4 µg/m³

Not counted on this day, too few days measured: Phenix City since 14 Apr 2023, Albany since 13 Apr 2023, Montgomery since 30 Mar 2023 and 7 more cities. Days missing from the source archive fall in this window, so fewer countries are counted.

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.