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 to26 Dec 2023 That day's board

The worst cities for PM2.5 over the 7 days to 26 Dec 2023: Lahore 363.4 µg/m³, Delhi 258.0 µg/m³ and Ulan Bator 195.0 µg/m³.

  1. 1LahorePakistan363.4
  2. 2DelhiIndia258.0
  3. 3Ulan BatorMongolia195.0
  4. 4DhakaBangladesh189.6
  5. 5KolkataIndia174.1
  6. 6PeshawarPakistan162.5
  7. 7N'DjamenaChad139.4
  8. 8IslamabadPakistan132.1
  9. 9SalorUzbekistan131.9
  10. 10HyderabadIndia129.1
  11. 11AbujaNigeria110.5
  12. 12Banja LukaBosnia and Herzegovina106.3
  13. 13DushanbeTajikistan97.1
  14. 14MumbaiIndia96.0
  15. 15SarajevoBosnia and Herzegovina92.0
  16. 16NišSerbia91.6
  17. 17LagosNigeria90.0
  18. 18KarachiPakistan89.7
  19. 19TetovoNorth Macedonia86.6
  20. 20SkopjeNorth Macedonia85.6

+ 2,206 more cities, 78.7 µg/m³ and below

Not counted on this day, too few days measured: Cairo since 24 Dec 2023, Manama since 12 Dec 2023, Tha Bo since 30 Nov 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.