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 29 Mar 2023: Radomsko 36.2 µg/m³, Gevgelija 34.5 µg/m³ and Banja Luka 33.5 µg/m³.
- 1RadomskoPoland36.2
- 2GevgelijaNorth Macedonia34.5
- 3Banja LukaBosnia and Herzegovina33.5
- 4KościanPoland33.2
- 5TetovoNorth Macedonia29.7
- 6WłocławekPoland29.2
- 7PrilepNorth Macedonia27.7
- 8OtwockPoland27.4
- 9SkopjeNorth Macedonia27.4
- 10LublinPoland27.3
- 11ŁaskPoland27.1
- 12Nakło nad NoteciąPoland26.8
- 13StarachowicePoland25.9
- 14StrumicaNorth Macedonia25.9
- 15Novo MestoSlovenia25.8
- 16DębicaPoland25.7
- 17LegionowoPoland25.5
- 18RacibórzPoland25.2
- 19KielcePoland24.9
- 20Jastrzębie ZdrójPoland24.9
+ 1,125 more cities, 24.4 µg/m³ and below
Not counted on this day, too few days measured: Gostivar since 29 Mar 2023, Koprivnica since 29 Mar 2023, Gjilan since 28 Mar 2023 and 65 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.