SmogRank / World / Slovenia / April 2025

Most polluted cities in Slovenia, April 2025

8 cities in Slovenia ranked by their average PM2.5 over the 30 days. Worst: Celje at 9.9 µg/m³, #1,132 of 2,569 cities in the world. Cleanest: Trbovlje at 8.3. A city needs measurements on 70% of the days to be ranked.

← Celje 9.9 µg/m³ 20 µg/m³0
Every city in Slovenia ranked for April 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. 1CeljeUrban Municipality of Celje
    52
  2. 2KranjUrban Municipality of Kranj
    52
  3. 3PtujUrban Municipality of Ptuj
    52
  4. 4LjubljanaLjubljana
    50
  5. 5KoperUrban Municipality of Koper
    49
  6. 6Novo MestoUrban Municipality of Novo Mesto
    49
  7. 6MariborUrban Municipality of Maribor
    49
  8. 8TrbovljeMunicipality of Trbovlje
    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, April 2025 · Slovenia now

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SmogRank, most polluted cities in Slovenia, PM2.5, April 2025, smogrank.com/si/history/2025-04 (accessed 2 Oct 2026).

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