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 9 Feb 2023: Banja Luka 55.1 µg/m³, Radomsko 49.3 µg/m³ and Ružomberok 47.6 µg/m³.
- 1Banja LukaBosnia and Herzegovina55.1
- 2RadomskoPoland49.3
- 3RužomberokSlovakia47.6
- 4Bielsko-BialaPoland47.1
- 5WłocławekPoland43.8
- 6Jastrzębie ZdrójPoland41.2
- 7Novo MestoSlovenia40.4
- 8DębicaPoland40.1
- 9RacibórzPoland39.7
- 10Nakło nad NoteciąPoland39.6
- 11RzeszówPoland38.1
- 12StrumicaNorth Macedonia38.1
- 13KrakówPoland37.9
- 14BohumínCzechia37.4
- 15Wodzisław ŚląskiPoland37.4
- 16KaliszPoland37.1
- 17KavadarciNorth Macedonia36.3
- 18KrapkowicePoland35.6
- 19KrosnoPoland35.1
- 20Český TěšínCzechia35.1
+ 1,161 more cities, 35.1 µg/m³ and below
Not counted on this day, too few days measured: Pejë since 5 Feb 2023, Mitrovicë since 5 Feb 2023, Jesi since 5 Feb 2023 and 56 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.