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 22 Mar 2023: Banja Luka 42.8 µg/m³, Gevgelija 38.3 µg/m³ and Marigliano 33.5 µg/m³.
- 1Banja LukaBosnia and Herzegovina42.8
- 2GevgelijaNorth Macedonia38.3
- 3MariglianoItaly33.5
- 4TetovoNorth Macedonia32.9
- 5RadomskoPoland32.5
- 6PrilepNorth Macedonia31.4
- 7KościanPoland31.1
- 8SkopjeNorth Macedonia30.5
- 9StrumicaNorth Macedonia30.4
- 10WłocławekPoland29.7
- 11KoprivnicaCroatia29.0
- 12GjilanKosovo28.8
- 13OtwockPoland28.2
- 14ŁaskPoland27.5
- 15KavadarciNorth Macedonia27.2
- 16GostivarNorth Macedonia27.0
- 17LublinPoland26.9
- 18Novo MestoSlovenia26.9
- 19RacibórzPoland26.8
- 20Jastrzębie ZdrójPoland26.3
+ 1,174 more cities, 26.1 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.