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 25 Feb 2023: Marigliano 66.9 µg/m³, Banja Luka 62.7 µg/m³ and Skopje 49.4 µg/m³.
- 1MariglianoItaly66.9
- 2Banja LukaBosnia and Herzegovina62.7
- 3SkopjeNorth Macedonia49.4
- 4TetovoNorth Macedonia49.2
- 5StrumicaNorth Macedonia47.1
- 6PrilepNorth Macedonia44.9
- 7KavadarciNorth Macedonia44.6
- 8GevgelijaNorth Macedonia44.3
- 9GjilanKosovo43.3
- 10KranjSlovenia42.5
- 11KoperSlovenia42.2
- 12BolzanoItaly42.1
- 13BeneventoItaly38.1
- 14OhridNorth Macedonia36.1
- 15GostivarNorth Macedonia36.1
- 16MostarBosnia and Herzegovina35.5
- 17LjubljanaSlovenia35.3
- 18TrbovljeSlovenia35.1
- 19Novo MestoSlovenia35.1
- 20KorçëAlbania34.5
+ 1,177 more cities, 33.4 µg/m³ and below
Not counted on this day, too few days measured: Pátra since 22 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.