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 27 Mar 2023: Gevgelija 35.8 µg/m³, Radomsko 34.9 µg/m³ and Banja Luka 34.6 µg/m³.
- 1GevgelijaNorth Macedonia35.8
- 2RadomskoPoland34.9
- 3Banja LukaBosnia and Herzegovina34.6
- 4KościanPoland32.4
- 5TetovoNorth Macedonia29.0
- 6WłocławekPoland29.0
- 7OtwockPoland27.9
- 8PrilepNorth Macedonia27.8
- 9LublinPoland27.2
- 10ŁaskPoland27.1
- 11KoprivnicaCroatia27.0
- 12SkopjeNorth Macedonia26.6
- 13StrumicaNorth Macedonia26.5
- 14Nakło nad NoteciąPoland25.9
- 15RacibórzPoland25.2
- 16StarachowicePoland25.1
- 17GjilanKosovo24.8
- 18Jastrzębie ZdrójPoland24.8
- 19Novo MestoSlovenia24.5
- 20DębicaPoland24.4
+ 1,160 more cities, 24.3 µg/m³ and below
Not counted on this day, too few days measured: Bihać since 23 Mar 2023, Kalisz since 14 Mar 2023, Ashgabat since 6 Feb 2023 and 62 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.