SmogRank / Countries / Slovenia / August 2025

Most polluted cities in Slovenia, August 2025

8 cities in Slovenia ranked by their average PM2.5 over the 31 days. Worst: Ljubljana at 9.5 µg/m³, #1,039 of 2,289 cities in the world. Cleanest: Trbovlje at 7.8. A city needs measurements on 70% of the days to be ranked.

  1. 1LjubljanaLjubljana
    9.5
  2. 1KranjUrban Municipality of Kranj
    9.5
  3. 3KoperUrban Municipality of Koper
    9.2
  4. 4CeljeUrban Municipality of Celje
    8.9
  5. 5PtujUrban Municipality of Ptuj
    8.6
  6. 6Novo MestoUrban Municipality of Novo Mesto
    8.2
  7. 6MariborUrban Municipality of Maribor
    8.2
  8. 8TrbovljeMunicipality of Trbovlje
    7.8
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, August 2025 · Slovenia now

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SmogRank, most polluted cities in Slovenia, PM2.5, August 2025, smogrank.com/si/history/2025-08 (accessed 2 Oct 2026).

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