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 30 days to30 Sep 2023 That day's board

The worst cities for PM2.5 over the 30 days to 30 Sep 2023: Dushanbe 61.0 µg/m³, Peshawar 59.9 µg/m³ and Coyhaique 55.5 µg/m³.

  1. 1DushanbeTajikistan61.0
  2. 2PeshawarPakistan59.9
  3. 3CoyhaiqueChile55.5
  4. 4Fort McMurrayCanada54.2
  5. 5LahorePakistan52.7
  6. 6Tha BoThailand49.0
  7. 7DhakaBangladesh47.2
  8. 8OsornoChile46.7
  9. 9Grande PrairieCanada46.1
  10. 10Puerto VarasChile45.9
  11. 11Prince AlbertCanada44.7
  12. 12EdmontonCanada44.6
  13. 13JakartaIndonesia44.4
  14. 14Şabāḩ as SālimKuwait41.4
  15. 15Fort St. JohnCanada41.3
  16. 16Ash ShīḩānīyahQatar41.1
  17. 17Grand CentreCanada40.7
  18. 18NacimientoChile40.6
  19. 19SaskatoonCanada40.4
  20. 20KampalaUganda39.9

+ 2,218 more cities, 38.8 µg/m³ and below

Not counted on this day, too few days measured: Kigali since 24 Sep 2023, Alexandria since 22 Sep 2023, Linares since 4 Sep 2023 and Manama since 3 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 readers for them. Most cities there are missing from this board, not clean. Why.