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 23 Feb 2023: Banja Luka 66.7 µg/m³, Strumica 63.0 µg/m³ and Marigliano 62.8 µg/m³.
- 1Banja LukaBosnia and Herzegovina66.7
- 2StrumicaNorth Macedonia63.0
- 3MariglianoItaly62.8
- 4TetovoNorth Macedonia61.1
- 5SkopjeNorth Macedonia59.7
- 6PrilepNorth Macedonia53.9
- 7GjilanKosovo52.5
- 8KavadarciNorth Macedonia52.1
- 9KoperSlovenia50.3
- 10GostivarNorth Macedonia48.4
- 11KranjSlovenia47.9
- 12GevgelijaNorth Macedonia44.0
- 13BolzanoItaly43.7
- 14KorçëAlbania40.2
- 15Novo MestoSlovenia40.2
- 16LjubljanaSlovenia40.2
- 17IlindenNorth Macedonia39.6
- 18KoprivnicaCroatia39.5
- 19TrbovljeSlovenia38.5
- 20BelgradeSerbia37.1
+ 1,176 more cities, 36.7 µg/m³ and below
Not counted on this day, too few days measured: Pátra since 22 Feb 2023, Pesaro since 19 Feb 2023, Codlea since 17 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.