SmogRank / Countries / Slovenia / 2026

Most polluted cities in Slovenia, 2026

8 cities in Slovenia ranked by their average PM2.5 so far (273 of 365 days); 8 above the WHO annual guideline (5.0 µg/m³). Worst: Ptuj at 12.4 µg/m³, #409 of 2,181 cities in the world. Cleanest: Koper at 8.3. A city needs measurements on 70% of the days to be ranked.

  1. 1PtujUrban Municipality of Ptuj
    12.42.5×
  2. 2CeljeUrban Municipality of Celje
    11.32.3×
  3. 3Novo MestoUrban Municipality of Novo Mesto
    10.92.2×
  4. 4LjubljanaLjubljana
    10.32.1×
  5. 5MariborUrban Municipality of Maribor
    9.92.0×
  6. 6KranjUrban Municipality of Kranj
    9.71.9×
  7. 7TrbovljeMunicipality of Trbovlje
    9.11.8×
  8. 8KoperUrban Municipality of Koper
    8.31.7×
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, 2026 · Slovenia now