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 to27 Aug 2023 That day's board

The worst cities for PM2.5 over the 7 days to 27 Aug 2023: Kamloops 126.4 µg/m³, Osorno 111.8 µg/m³ and Grants Pass 108.5 µg/m³.

  1. 1KamloopsCanada126.4
  2. 2OsornoChile111.8
  3. 3Grants PassUnited States108.5
  4. 4Puerto VarasChile107.3
  5. 5MedfordUnited States99.8
  6. 6AshlandUnited States99.6
  7. 7TalentUnited States93.3
  8. 8ManamaBahrain79.8
  9. 9NacimientoChile70.6
  10. 10Fort McMurrayCanada69.2
  11. 11RedmondUnited States64.9
  12. 12YrekaUnited States62.0
  13. 13GreenUnited States61.8
  14. 14La UniónChile61.5
  15. 15PentictonCanada59.6
  16. 16Puerto MonttChile53.1
  17. 17Şabāḩ as SālimKuwait50.8
  18. 18AlexandriaEgypt49.7
  19. 19PeshawarPakistan48.8
  20. 20DushanbeTajikistan48.6

+ 1,498 more cities, 48.4 µg/m³ and below

Not counted on this day, too few days measured: Ash Shīḩānīyah since 27 Aug 2023, Ceglie Messapica since 28 Jul 2023, Laja since 27 Jul 2023 and Hualpén since 26 Jul 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.