SmogRank / Countries / Slovenia / 2025

Most polluted cities in Slovenia, 2025

8 cities in Slovenia ranked by their average PM2.5 over the 365 days; 8 above the WHO annual guideline (5.0 µg/m³). Worst: Celje at 14.6 µg/m³, #257 of 2,131 cities in the world. Cleanest: Koper at 10.2. A city needs measurements on 70% of the days to be ranked.

  1. 1CeljeUrban Municipality of Celje
    14.62.9×
  2. 2KranjUrban Municipality of Kranj
    14.22.8×
  3. 3PtujUrban Municipality of Ptuj
    13.72.7×
  4. 4Novo MestoUrban Municipality of Novo Mesto
    13.42.7×
  5. 5LjubljanaLjubljana
    13.02.6×
  6. 6TrbovljeMunicipality of Trbovlje
    12.22.4×
  7. 7MariborUrban Municipality of Maribor
    11.82.4×
  8. 8KoperUrban Municipality of Koper
    10.22.0×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, 2025 · Slovenia now