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 30 days to 20 Mar 2023: Banja Luka 45.1 µg/m³, Gevgelija 38.1 µg/m³ and Marigliano 34.2 µg/m³.
- 1Banja LukaBosnia and Herzegovina45.1
- 2GevgelijaNorth Macedonia38.1
- 3MariglianoItaly34.2
- 4TetovoNorth Macedonia33.8
- 5SkopjeNorth Macedonia31.9
- 6StrumicaNorth Macedonia31.7
- 7PrilepNorth Macedonia31.7
- 8RadomskoPoland31.1
- 9KościanPoland30.0
- 10GjilanKosovo29.5
- 11KavadarciNorth Macedonia28.6
- 12KoprivnicaCroatia28.5
- 13WłocławekPoland28.4
- 14Novo MestoSlovenia27.2
- 15GostivarNorth Macedonia27.0
- 16OtwockPoland26.9
- 17KranjSlovenia26.9
- 18ŁaskPoland26.1
- 19LublinPoland25.5
- 20RacibórzPoland25.3
+ 1,176 more cities, 25.1 µg/m³ and below
Not counted on this day, too few days measured: Kalisz since 14 Mar 2023, Ashgabat since 6 Feb 2023, Kigali since 6 Feb 2023 and 61 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.