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 4 Mar 2023: Banja Luka 63.1 µg/m³, Strumica 51.9 µg/m³ and Tetovo 45.6 µg/m³.
- 1Banja LukaBosnia and Herzegovina63.1
- 2StrumicaNorth Macedonia51.9
- 3TetovoNorth Macedonia45.6
- 4SkopjeNorth Macedonia45.2
- 5PrilepNorth Macedonia44.2
- 6KavadarciNorth Macedonia43.5
- 7GevgelijaNorth Macedonia43.1
- 8MariglianoItaly42.0
- 9GostivarNorth Macedonia40.3
- 10Novo MestoSlovenia40.0
- 11RadomskoPoland39.2
- 12Spišská Nová VesSlovakia36.5
- 13KoprivnicaCroatia36.0
- 14KranjSlovenia35.7
- 15RužomberokSlovakia35.6
- 16BihaćBosnia and Herzegovina35.1
- 17Bielsko-BialaPoland34.4
- 18KłodzkoPoland34.3
- 19RacibórzPoland33.9
- 20BelgradeSerbia33.8
+ 1,172 more cities, 33.2 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.