SmogRank / History / City race
Cities in Slovenia, 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 in Slovenia for PM2.5 over the 30 days to 10 Dec 2025: Novo Mesto 17.9 µg/m³, Kranj 17.7 µg/m³ and Nova Gorica 17.3 µg/m³.
- 1Novo MestoUrban Municipality of Novo Mesto17.9
- 2KranjUrban Municipality of Kranj17.7
- 3Nova GoricaUrban Municipality of Nova Gorica17.3
- 4Zagorje ob SaviMunicipality of Zagorje ob Savi17.2
- 5Murska SobotaUrban Municipality of Murska Sobota17.2
- 6LjubljanaLjubljana16.8
- 7CeljeUrban Municipality of Celje16.6
- 8PtujUrban Municipality of Ptuj16.5
- 9TrbovljeMunicipality of Trbovlje14.6
- 10MariborUrban Municipality of Maribor12.8
- 11KoperUrban Municipality of Koper12.6
- 12KostelMunicipality of Kostel4.7
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.