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 to17 Sep 2023 That day's board

The worst cities for PM2.5 over the 30 days to 17 Sep 2023: Fort McMurray 66.7 µg/m³, Dushanbe 64.5 µg/m³ and Osorno 63.2 µg/m³.

  1. 1Fort McMurrayCanada66.7
  2. 2DushanbeTajikistan64.5
  3. 3OsornoChile63.2
  4. 4Puerto VarasChile61.8
  5. 5Grande PrairieCanada56.8
  6. 6PeshawarPakistan55.7
  7. 7DhakaBangladesh55.5
  8. 8AlexandriaEgypt54.5
  9. 9EdmontonCanada52.7
  10. 10NacimientoChile52.0
  11. 11CoyhaiqueChile49.8
  12. 12KamloopsCanada49.3
  13. 13Fort St. JohnCanada48.8
  14. 14Prince AlbertCanada48.8
  15. 15LahorePakistan48.4
  16. 16Grants PassUnited States47.0
  17. 17JakartaIndonesia46.1
  18. 18Grand CentreCanada44.8
  19. 19Şabāḩ as SālimKuwait44.2
  20. 20La UniónChile43.5

+ 2,079 more cities, 42.8 µg/m³ and below

Not counted on this day, too few days measured: Ash Shīḩānīyah since 4 Sep 2023, Linares since 4 Sep 2023, Manama since 3 Sep 2023 and 2 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.