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 to24 Feb 2023 That day's board

The worst cities for PM2.5 over the 30 days to 24 Feb 2023: Banja Luka 66.2 µg/m³, Strumica 59.4 µg/m³ and Skopje 52.3 µg/m³.

  1. 1Banja LukaBosnia and Herzegovina66.2
  2. 2StrumicaNorth Macedonia59.4
  3. 3SkopjeNorth Macedonia52.3
  4. 4TetovoNorth Macedonia50.9
  5. 5KavadarciNorth Macedonia50.3
  6. 6PrilepNorth Macedonia49.4
  7. 7MariglianoItaly47.3
  8. 8Novo MestoSlovenia45.3
  9. 9GostivarNorth Macedonia43.3
  10. 10GevgelijaNorth Macedonia42.9
  11. 11KranjSlovenia40.0
  12. 12LjubljanaSlovenia38.7
  13. 13BitolaNorth Macedonia37.8
  14. 14TrbovljeSlovenia37.6
  15. 15Spišská Nová VesSlovakia36.2
  16. 16CeljeSlovenia35.8
  17. 17IlindenNorth Macedonia35.7
  18. 18BihaćBosnia and Herzegovina35.7
  19. 19KorçëAlbania35.3
  20. 20KoperSlovenia34.4

+ 1,125 more cities, 34.2 µg/m³ and below

Not counted on this day, too few days measured: Ashgabat since 6 Feb 2023, Kigali since 6 Feb 2023, Addis Ababa since 6 Feb 2023 and 60 more cities. Days missing from the source archive fall in this window, so fewer countries are counted.

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.