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 7 Aug 2026: Nova Gorica 8.8 µg/m³, Ljubljana 8.7 µg/m³ and Kranj 8.2 µg/m³.
- 1Nova GoricaUrban Municipality of Nova Gorica8.8
- 2LjubljanaLjubljana8.7
- 3KranjUrban Municipality of Kranj8.2
- 4PtujUrban Municipality of Ptuj8.1
- 5KoperUrban Municipality of Koper7.7
- 6CeljeUrban Municipality of Celje7.7
- 7MariborUrban Municipality of Maribor7.4
- 8Zagorje ob SaviMunicipality of Zagorje ob Savi7.3
- 9Murska SobotaUrban Municipality of Murska Sobota7.3
- 10TrbovljeMunicipality of Trbovlje7.1
- 11Novo MestoUrban Municipality of Novo Mesto7.1
- 12KostelMunicipality of Kostel7.0
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.