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 to28 Feb 2023 That day's board

The worst cities for PM2.5 over the 30 days to 28 Feb 2023: Banja Luka 62.7 µg/m³, Strumica 55.8 µg/m³ and Skopje 48.2 µg/m³.

  1. 1Banja LukaBosnia and Herzegovina62.7
  2. 2StrumicaNorth Macedonia55.8
  3. 3SkopjeNorth Macedonia48.2
  4. 4TetovoNorth Macedonia47.8
  5. 5MariglianoItaly47.6
  6. 6PrilepNorth Macedonia46.7
  7. 7KavadarciNorth Macedonia46.7
  8. 8GevgelijaNorth Macedonia44.4
  9. 9GostivarNorth Macedonia40.8
  10. 10Novo MestoSlovenia40.7
  11. 11KranjSlovenia36.3
  12. 12Spišská Nová VesSlovakia35.7
  13. 13BitolaNorth Macedonia34.9
  14. 14KorçëAlbania34.7
  15. 15LjubljanaSlovenia34.5
  16. 16TrbovljeSlovenia33.6
  17. 17BelgradeSerbia33.2
  18. 18BihaćBosnia and Herzegovina33.1
  19. 19IlindenNorth Macedonia33.0
  20. 20RužomberokSlovakia33.0

+ 1,157 more cities, 32.7 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.