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 to7 Oct 2023 That day's board

The worst cities for PM2.5 over the 30 days to 7 Oct 2023: Peshawar 68.6 µg/m³, Lahore 60.3 µg/m³ and Dushanbe 53.3 µg/m³.

  1. 1PeshawarPakistan68.6
  2. 2LahorePakistan60.3
  3. 3DushanbeTajikistan53.3
  4. 4Tha BoThailand50.7
  5. 5JakartaIndonesia46.3
  6. 6CoyhaiqueChile45.6
  7. 7N'DjamenaChad42.8
  8. 8DelhiIndia42.1
  9. 9DhakaBangladesh41.6
  10. 10Puerto VarasChile41.1
  11. 11KampalaUganda39.6
  12. 12NacimientoChile39.0
  13. 13KarachiPakistan38.5
  14. 14Şabāḩ as SālimKuwait38.2
  15. 15OsornoChile38.0
  16. 16Ash ShīḩānīyahQatar37.2
  17. 17Grande PrairieCanada35.3
  18. 18La UniónChile34.6
  19. 19IslamabadPakistan34.2
  20. 20HanoiVietnam34.2

+ 2,185 more cities, 33.4 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.