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 Nov 2025: Novo Mesto 11.9 µg/m³, Murska Sobota 11.5 µg/m³ and Zagorje ob Savi 11.0 µg/m³.
- 1Novo MestoUrban Municipality of Novo Mesto11.9
- 2Murska SobotaUrban Municipality of Murska Sobota11.5
- 3Zagorje ob SaviMunicipality of Zagorje ob Savi11.0
- 4CeljeUrban Municipality of Celje10.9
- 5LjubljanaLjubljana10.4
- 6PtujUrban Municipality of Ptuj9.5
- 7TrbovljeMunicipality of Trbovlje9.0
- 8Nova GoricaUrban Municipality of Nova Gorica8.3
- 9MariborUrban Municipality of Maribor7.9
- 10KoperUrban Municipality of Koper5.6
- 11KostelMunicipality of Kostel4.0
Not counted on this day, too few days measured: Kranj since 7 Nov 2025.
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.