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 26 Mar 2023: Gevgelija 36.8 µg/m³, Banja Luka 34.7 µg/m³ and Radomsko 34.0 µg/m³.
- 1GevgelijaNorth Macedonia36.8
- 2Banja LukaBosnia and Herzegovina34.7
- 3RadomskoPoland34.0
- 4KościanPoland31.5
- 5TetovoNorth Macedonia29.4
- 6WłocławekPoland28.9
- 7PrilepNorth Macedonia28.2
- 8OtwockPoland27.6
- 9StrumicaNorth Macedonia27.4
- 10MariglianoItaly27.3
- 11SkopjeNorth Macedonia27.1
- 12LublinPoland27.0
- 13ŁaskPoland26.8
- 14KoprivnicaCroatia26.4
- 15GjilanKosovo25.4
- 16RacibórzPoland25.1
- 17Nakło nad NoteciąPoland25.1
- 18KavadarciNorth Macedonia24.9
- 19StarachowicePoland24.4
- 20Jastrzębie ZdrójPoland24.4
+ 1,162 more cities, 24.0 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.