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.
The worst cities for PM2.5 over the 7 days to 21 Feb 2023: Strumica 71.0 µg/m³, Banja Luka 66.6 µg/m³ and Tetovo 65.8 µg/m³.
- 1StrumicaNorth Macedonia71.0
- 2Banja LukaBosnia and Herzegovina66.6
- 3TetovoNorth Macedonia65.8
- 4MariglianoItaly61.8
- 5SkopjeNorth Macedonia60.7
- 6PrilepNorth Macedonia58.8
- 7KavadarciNorth Macedonia58.2
- 8GjilanKosovo55.0
- 9GostivarNorth Macedonia53.3
- 10KoperSlovenia50.5
- 11GevgelijaNorth Macedonia46.3
- 12KranjSlovenia46.2
- 13KorçëAlbania44.7
- 14IlindenNorth Macedonia43.9
- 15BelgradeSerbia42.3
- 16KoprivnicaCroatia41.9
- 17LjubljanaSlovenia40.9
- 18Novo MestoSlovenia39.4
- 19AnconaItaly38.9
- 20CeljeSlovenia37.9
+ 1,170 more cities, 37.2 µg/m³ and below
Not counted on this day, too few days measured: Pesaro since 19 Feb 2023, Codlea since 17 Feb 2023, Ashgabat since 4 Feb 2023 and 52 more cities. Days missing from the source archive fall in this window, so fewer countries are counted.
Cities counted each 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.