SmogRank / History / City race

Cities, 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 7 days to28 Aug 2023 That day's board

The worst cities for PM2.5 over the 7 days to 28 Aug 2023: Grants Pass 122.5 µg/m³, Ashland 114.6 µg/m³ and Medford 112.5 µg/m³.

  1. 1Grants PassUnited States122.5
  2. 2AshlandUnited States114.6
  3. 3MedfordUnited States112.5
  4. 4OsornoChile111.9
  5. 5Puerto VarasChile110.1
  6. 6TalentUnited States108.5
  7. 7YrekaUnited States93.7
  8. 8GreenUnited States84.5
  9. 9Fort McMurrayCanada81.3
  10. 10NacimientoChile75.3
  11. 11La UniónChile62.7
  12. 12RedmondUnited States59.5
  13. 13Puerto MonttChile53.8
  14. 14BendUnited States53.5
  15. 15KampalaUganda52.2
  16. 16AlexandriaEgypt51.4
  17. 17Los ÁngelesChile51.0
  18. 18Fort St. JohnCanada51.0
  19. 19KamloopsCanada48.9
  20. 20DhakaBangladesh47.8

+ 1,516 more cities, 46.3 µg/m³ and below

Not counted on this day, too few days measured: Manama since 28 Aug 2023, Jakarta since 28 Aug 2023, Ash Shīḩānīyah since 27 Aug 2023 and 3 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.