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 24 Mar 2023: Banja Luka 38.7 µg/m³, Gevgelija 38.1 µg/m³ and Radomsko 33.2 µg/m³.
- 1Banja LukaBosnia and Herzegovina38.7
- 2GevgelijaNorth Macedonia38.1
- 3RadomskoPoland33.2
- 4KościanPoland31.5
- 5TetovoNorth Macedonia31.3
- 6MariglianoItaly30.9
- 7WłocławekPoland30.2
- 8PrilepNorth Macedonia29.8
- 9SkopjeNorth Macedonia28.9
- 10OtwockPoland28.6
- 11StrumicaNorth Macedonia28.3
- 12KoprivnicaCroatia27.9
- 13LublinPoland27.7
- 14ŁaskPoland27.6
- 15GjilanKosovo27.1
- 16RacibórzPoland26.9
- 17KavadarciNorth Macedonia26.4
- 18Jastrzębie ZdrójPoland26.1
- 19Novo MestoSlovenia25.6
- 20GostivarNorth Macedonia25.3
+ 1,171 more cities, 25.3 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.