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 to27 Sep 2023 That day's board

The worst cities for PM2.5 over the 30 days to 27 Sep 2023: Dushanbe 61.6 µg/m³, Fort McMurray 57.7 µg/m³ and Peshawar 55.1 µg/m³.

  1. 1DushanbeTajikistan61.6
  2. 2Fort McMurrayCanada57.7
  3. 3PeshawarPakistan55.1
  4. 4CoyhaiqueChile54.5
  5. 5DhakaBangladesh53.2
  6. 6Grande PrairieCanada51.8
  7. 7LahorePakistan51.1
  8. 8Tha BoThailand50.0
  9. 9Puerto VarasChile50.0
  10. 10Prince AlbertCanada48.4
  11. 11OsornoChile47.5
  12. 12EdmontonCanada47.3
  13. 13JakartaIndonesia44.6
  14. 14Fort St. JohnCanada44.4
  15. 15Grand CentreCanada43.7
  16. 16SaskatoonCanada43.5
  17. 17ReginaCanada42.5
  18. 18NacimientoChile42.3
  19. 19Ash ShīḩānīyahQatar41.1
  20. 20Şabāḩ as SālimKuwait40.9

+ 2,240 more cities, 39.3 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 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.