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 7 Feb 2023: Banja Luka 50.3 µg/m³, Radomsko 46.9 µg/m³ and Bailén 37.5 µg/m³.
- 1Banja LukaBosnia and Herzegovina50.3
- 2RadomskoPoland46.9
- 3BailénSpain37.5
- 4Novo MestoSlovenia36.0
- 5MariglianoItaly34.8
- 6StrumicaNorth Macedonia33.8
- 7MillcreekUnited States31.9
- 8AmoraPortugal31.8
- 9WłocławekPoland31.5
- 10Bielsko-BialaPoland31.5
- 11BitolaNorth Macedonia31.1
- 12KranjSlovenia31.1
- 13West JordanUnited States30.9
- 14Nakło nad NoteciąPoland29.5
- 15KoperSlovenia29.1
- 16KaliszPoland29.0
- 17Jastrzębie ZdrójPoland29.0
- 18SallanchesFrance28.4
- 19GevgelijaNorth Macedonia27.8
- 20VigoSpain27.8
+ 1,155 more cities, 27.7 µg/m³ and below
Not counted on this day, too few days measured: Turin since 7 Feb 2023, Pejë since 5 Feb 2023, Mitrovicë since 5 Feb 2023 and 58 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.