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 to13 Jul 2025 That day's board

The worst cities in Slovenia for PM2.5 over the 30 days to 13 Jul 2025: Ljubljana 9.5 µg/m³, Nova Gorica 9.4 µg/m³ and Kranj 9.3 µg/m³.

  1. 1LjubljanaLjubljana9.5
  2. 2Nova GoricaUrban Municipality of Nova Gorica9.4
  3. 3KranjUrban Municipality of Kranj9.3
  4. 4CeljeUrban Municipality of Celje8.7
  5. 5Zagorje ob SaviMunicipality of Zagorje ob Savi8.5
  6. 6PtujUrban Municipality of Ptuj8.5
  7. 7MariborUrban Municipality of Maribor8.5
  8. 8Murska SobotaUrban Municipality of Murska Sobota8.2
  9. 9KoperUrban Municipality of Koper8.0
  10. 10TrbovljeMunicipality of Trbovlje7.9
  11. 11KostelMunicipality of Kostel7.9
  12. 12Novo MestoUrban Municipality of Novo Mesto7.8

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.