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 to10 Sep 2024 That day's board

The worst cities for PM2.5 over the 7 days to 10 Sep 2024: Kinshasa 113.4 µg/m³, Dushanbe 80.3 µg/m³ and Santa María 75.3 µg/m³.

  1. 1KinshasaDemocratic Republic of the Congo113.4
  2. 2DushanbeTajikistan80.3
  3. 3Santa MaríaPeru75.3
  4. 4AsunciónParaguay69.9
  5. 5LahorePakistan67.0
  6. 6OsornoChile53.7
  7. 7PeshawarPakistan51.8
  8. 8VillarricaChile50.9
  9. 9PrinevilleUnited States50.4
  10. 10Grande PrairieCanada49.4
  11. 11KampalaUganda48.1
  12. 12Puerto VarasChile46.3
  13. 13La UniónChile45.8
  14. 14BaghdadIraq45.7
  15. 15DhakaBangladesh45.5
  16. 16ValdiviaChile45.5
  17. 17Ash ShīḩānīyahQatar45.4
  18. 18LajaChile44.3
  19. 19Addis AbabaEthiopia43.2
  20. 20NacimientoChile42.5

+ 2,016 more cities, 41.8 µg/m³ and below

Not counted on this day, too few days measured: São Paulo since 8 Sep 2024, Baku since 7 Sep 2024 and Manama since 16 Aug 2024.

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.