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.

CountriesCities
The 30 days to6 Oct 2026 That day's board

The worst cities in Slovenia for PM2.5 over the 30 days to 6 Oct 2026: Ljubljana 8.6 µg/m³, Celje 7.4 µg/m³ and Novo Mesto 6.9 µg/m³.

  1. 1LjubljanaLjubljana8.6
  2. 2CeljeUrban Municipality of Celje7.4
  3. 3Novo MestoUrban Municipality of Novo Mesto6.9
  4. 4KranjUrban Municipality of Kranj6.9
  5. 5Murska SobotaUrban Municipality of Murska Sobota6.7
  6. 6PtujUrban Municipality of Ptuj6.5
  7. 7TrbovljeMunicipality of Trbovlje6.4
  8. 8MariborUrban Municipality of Maribor6.1
  9. 9Zagorje ob SaviMunicipality of Zagorje ob Savi6.0
  10. 10Nova GoricaUrban Municipality of Nova Gorica5.9
  11. 11KoperUrban Municipality of Koper4.9
  12. 12KostelMunicipality of Kostel4.9

30 days7 days
GoodModerateSensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that 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.