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 to25 Sep 2023 That day's board

The worst cities in United States for PM2.5 over the 30 days to 25 Sep 2023: Yreka 38.4 µg/m³, Grants Pass 29.9 µg/m³ and Green 28.7 µg/m³.

  1. 1YrekaCalifornia38.4
  2. 2Grants PassOregon29.9
  3. 3GreenOregon28.7
  4. 4MedfordOregon25.8
  5. 5AshlandOregon24.3
  6. 6TalentOregon23.7
  7. 7MarshallMinnesota22.8
  8. 8BendOregon21.5
  9. 9RedmondOregon21.0
  10. 10West FargoNorth Dakota19.4
  11. 11BirminghamAlabama19.1
  12. 12Miles CityMontana18.5
  13. 13VermillionSouth Dakota18.3
  14. 14Crescent CityCalifornia18.3
  15. 15HavreMontana17.2
  16. 16TopekaKansas16.4
  17. 17Great FallsMontana16.4
  18. 18DerbyKansas16.2
  19. 19HaysvilleKansas16.2
  20. 20WichitaKansas16.2

+ 743 more cities, the next at 16.2 µg/m³

Not counted on this day, too few days measured: Lincoln since 23 Sep 2023.

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.