SmogRank / World / Slovenia / October 2026

Most polluted cities in Slovenia, October 2026

8 cities in Slovenia ranked by their average PM2.5 so far (1 of 31 days). Worst: Ljubljana at 11.5 µg/m³, #448 of 1,630 cities in the world. Cleanest: Koper at 8.2. A city needs measurements on 70% of the days to be ranked.

← Ljubljana 11.5 µg/m³ 20 µg/m³0
Every city in Slovenia ranked for October 2026, 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. 1LjubljanaLjubljana
    55
  2. 2CeljeUrban Municipality of Celje
    55
  3. 3PtujUrban Municipality of Ptuj
    55
  4. 4TrbovljeMunicipality of Trbovlje
    53
  5. 4Novo MestoUrban Municipality of Novo Mesto
    53
  6. 6KranjUrban Municipality of Kranj
    52
  7. 7MariborUrban Municipality of Maribor
    49
  8. 8KoperUrban Municipality of Koper
    46
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). 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, October 2026 · Slovenia now

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SmogRank, most polluted cities in Slovenia, PM2.5, October 2026 (so far), smogrank.com/si/history/2026-10 (accessed 2 Oct 2026).

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