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 11 Mar 2023: Banja Luka 59.7 µg/m³, Strumica 48.9 µg/m³ and Skopje 45.4 µg/m³.
- 1Banja LukaBosnia and Herzegovina59.7
- 2StrumicaNorth Macedonia48.9
- 3SkopjeNorth Macedonia45.4
- 4GevgelijaNorth Macedonia45.3
- 5TetovoNorth Macedonia45.2
- 6PrilepNorth Macedonia43.2
- 7MariglianoItaly43.1
- 8KavadarciNorth Macedonia41.0
- 9GostivarNorth Macedonia37.4
- 10Novo MestoSlovenia36.3
- 11GjilanKosovo35.8
- 12KoprivnicaCroatia35.6
- 13KranjSlovenia34.8
- 14BelgradeSerbia33.5
- 15BihaćBosnia and Herzegovina33.5
- 16Spišská Nová VesSlovakia32.8
- 17LjubljanaSlovenia32.5
- 18KorçëAlbania31.6
- 19OhridNorth Macedonia31.3
- 20RadomskoPoland31.3
+ 1,176 more cities, 31.0 µg/m³ and below
Not counted on this day, too few days measured: Ashgabat since 6 Feb 2023, Kigali since 6 Feb 2023, Addis Ababa since 6 Feb 2023 and 60 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.