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 11 Mar 2023: Banja Luka 40.2 µg/m³, Gevgelija 39.3 µg/m³ and Skopje 31.3 µg/m³.
- 1Banja LukaBosnia and Herzegovina40.2
- 2GevgelijaNorth Macedonia39.3
- 3SkopjeNorth Macedonia31.3
- 4GjilanKosovo28.6
- 5Nakło nad NoteciąPoland28.3
- 6PrilepNorth Macedonia28.0
- 7TetovoNorth Macedonia27.8
- 8MariglianoItaly26.8
- 9VoluntariRomania26.6
- 10KavadarciNorth Macedonia26.3
- 11WłocławekPoland26.3
- 12StrumicaNorth Macedonia26.1
- 13KościanPoland26.0
- 14Novo MestoSlovenia25.6
- 15BufteaRomania25.5
- 16KoprivnicaCroatia24.9
- 17CeljeSlovenia24.1
- 18KranjSlovenia23.9
- 19Popeşti-LeordeniRomania23.6
- 20TrbovljeSlovenia23.1
+ 1,169 more cities, 23.1 µg/m³ and below
Not counted on this day, too few days measured: Kalisz since 9 Mar 2023, Pátra since 22 Feb 2023, Ashgabat since 4 Feb 2023 and 52 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.