SmogRank / Countries / Slovenia / April 2026

Most polluted cities in Slovenia, April 2026

8 cities in Slovenia ranked by their average PM2.5 over the 30 days. Worst: Ptuj at 9.8 µg/m³, #621 of 2,283 cities in the world. Cleanest: Koper at 7.2. A city needs measurements on 70% of the days to be ranked.

  1. 1PtujUrban Municipality of Ptuj
    9.8
  2. 1CeljeUrban Municipality of Celje
    9.8
  3. 3KranjUrban Municipality of Kranj
    9.1
  4. 4LjubljanaLjubljana
    9.0
  5. 5Novo MestoUrban Municipality of Novo Mesto
    8.6
  6. 6MariborUrban Municipality of Maribor
    8.3
  7. 7TrbovljeMunicipality of Trbovlje
    8.2
  8. 8KoperUrban Municipality of Koper
    7.2
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, April 2026 · Slovenia now