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 to18 Jun 2024 That day's board

The worst cities in United States for PM2.5 over the 30 days to 18 Jun 2024: Port Isabel 34.1 µg/m³, Mission 29.7 µg/m³ and Timberwood Park 25.4 µg/m³.

  1. 1Port IsabelTexas34.1
  2. 2MissionTexas29.7
  3. 3Timberwood ParkTexas25.4
  4. 4EdinburgTexas24.2
  5. 5LaredoTexas23.5
  6. 6Corpus ChristiTexas22.9
  7. 7Live OakTexas21.6
  8. 8HelotesTexas19.3
  9. 9AustinTexas18.4
  10. 10WindcrestTexas18.3
  11. 11Wells BranchTexas17.7
  12. 12Eagle PassTexas17.4
  13. 13ConroeTexas17.3
  14. 14HoustonTexas17.3
  15. 15Missouri CityTexas16.5
  16. 16River OaksTexas16.5
  17. 17SaginawTexas16.5
  18. 18San AntonioTexas16.5
  19. 19DallasTexas16.2
  20. 20San MarcosTexas16.1

+ 783 more cities, 16.1 µg/m³ and below

Not counted on this day, too few days measured: Socorro since 15 May 2024 and Wichita since 30 Apr 2024.

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.