SmogRank / World / Slovenia / January 2026

Most polluted cities in Slovenia, January 2026

8 cities in Slovenia ranked by their average PM2.5 over the 31 days. Worst: Ptuj at 33.5 µg/m³, #137 of 2,281 cities in the world. Cleanest: Koper at 16.9. A city needs measurements on 70% of the days to be ranked.

← Ptuj 33.5 µg/m³ 30 µg/m³0
Every city in Slovenia ranked for January 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. 1PtujUrban Municipality of Ptuj
    96
  2. 2Novo MestoUrban Municipality of Novo Mesto
    84
  3. 3MariborUrban Municipality of Maribor
    82
  4. 4CeljeUrban Municipality of Celje
    80
  5. 5LjubljanaLjubljana
    76
  6. 6KranjUrban Municipality of Kranj
    71
  7. 7TrbovljeMunicipality of Trbovlje
    71
  8. 8KoperUrban Municipality of Koper
    66
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, January 2026 · Slovenia now

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SmogRank, most polluted cities in Slovenia, PM2.5, January 2026, smogrank.com/si/history/2026-01 (accessed 2 Oct 2026).

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