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 20 Feb 2023: Strumica 73.3 µg/m³, Tetovo 68.7 µg/m³ and Skopje 64.0 µg/m³.
- 1StrumicaNorth Macedonia73.3
- 2TetovoNorth Macedonia68.7
- 3SkopjeNorth Macedonia64.0
- 4MariglianoItaly63.5
- 5Banja LukaBosnia and Herzegovina62.0
- 6KavadarciNorth Macedonia61.2
- 7PrilepNorth Macedonia60.2
- 8GjilanKosovo57.1
- 9GostivarNorth Macedonia53.5
- 10KoperSlovenia50.6
- 11GevgelijaNorth Macedonia49.0
- 12KranjSlovenia46.8
- 13IlindenNorth Macedonia46.5
- 14KorçëAlbania46.4
- 15BelgradeSerbia43.5
- 16KoprivnicaCroatia43.1
- 17LjubljanaSlovenia41.2
- 18Novo MestoSlovenia39.9
- 19AnconaItaly39.2
- 20CeljeSlovenia39.0
+ 1,166 more cities, 38.2 µg/m³ and below
Not counted on this day, too few days measured: Pesaro since 19 Feb 2023, Codlea since 17 Feb 2023, Jasło since 16 Feb 2023 and 53 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.