SmogRank / World / Slovenia / September 2025

Most polluted cities in Slovenia, September 2025

8 cities in Slovenia ranked by their average PM2.5 over the 30 days. Worst: Maribor at 6.6 µg/m³, #1,637 of 2,711 cities in the world. Cleanest: Koper at 5.3. A city needs measurements on 70% of the days to be ranked.

← Maribor 6.6
Every city in Slovenia ranked for September 2025, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1MariborUrban Municipality of Maribor
    12
  2. 2PtujUrban Municipality of Ptuj
    12
  3. 3LjubljanaLjubljana
    10
  4. 3CeljeUrban Municipality of Celje
    10
  5. 5Novo MestoUrban Municipality of Novo Mesto
    10
  6. 6KranjUrban Municipality of Kranj
    10
  7. 7TrbovljeMunicipality of Trbovlje
    8
  8. 8KoperUrban Municipality of Koper
    8
Good0–50
Satisfactory51–100
Moderate101–200
Poor201–300
Very poor301–400
Severe401+

India's National Air Quality Index (CPCB), PM2.5 sub-index. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, September 2025 · Slovenia now

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SmogRank, most polluted cities in Slovenia, PM2.5, September 2025, smogrank.com/si/history/2025-09 (accessed 2 Oct 2026).

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