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 µg/m³ 20 µg/m³0
Every city in Slovenia ranked for September 2025, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1MariborUrban Municipality of Maribor
    6.6
  2. 2PtujUrban Municipality of Ptuj
    6.5
  3. 3LjubljanaLjubljana
    6.4
  4. 3CeljeUrban Municipality of Celje
    6.4
  5. 5Novo MestoUrban Municipality of Novo Mesto
    6.1
  6. 6KranjUrban Municipality of Kranj
    5.8
  7. 7TrbovljeMunicipality of Trbovlje
    5.4
  8. 8KoperUrban Municipality of Koper
    5.3
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

PM2.5 in µg/m³, coloured by the US EPA's PM2.5 categories. 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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