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 6 Sep 2026: Ljubljana 6.9 µg/m³, Nova Gorica 6.7 µg/m³ and Kranj 6.7 µg/m³.
- 1LjubljanaLjubljana6.9
- 2Nova GoricaUrban Municipality of Nova Gorica6.7
- 3KranjUrban Municipality of Kranj6.7
- 4PtujUrban Municipality of Ptuj6.6
- 5CeljeUrban Municipality of Celje6.3
- 6KostelMunicipality of Kostel6.3
- 7Murska SobotaUrban Municipality of Murska Sobota6.2
- 8Novo MestoUrban Municipality of Novo Mesto6.1
- 9MariborUrban Municipality of Maribor6.0
- 10KoperUrban Municipality of Koper6.0
- 11Zagorje ob SaviMunicipality of Zagorje ob Savi5.9
- 12TrbovljeMunicipality of Trbovlje5.7
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.