SmogRank / World / Slovenia / September 2026

Most polluted cities in Slovenia, September 2026

8 cities in Slovenia ranked by their average PM2.5 over the 30 days. Worst: Ljubljana at 6.9 µg/m³, #1,213 of 2,646 cities in the world. Cleanest: Koper at 4.2. A city needs measurements on 70% of the days to be ranked.

← Ljubljana 6.9
Every city in Slovenia ranked for September 2026, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1LjubljanaLjubljana
    12
  2. 2CeljeUrban Municipality of Celje
    10
  3. 3KranjUrban Municipality of Kranj
    10
  4. 4PtujUrban Municipality of Ptuj
    10
  5. 4Novo MestoUrban Municipality of Novo Mesto
    10
  6. 6TrbovljeMunicipality of Trbovlje
    8
  7. 7MariborUrban Municipality of Maribor
    8
  8. 8KoperUrban Municipality of Koper
    7
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 2026 · Slovenia now

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

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