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
    9.9
  2. 2KranjUrban Municipality of Kranj
    9.6
  3. 3PtujUrban Municipality of Ptuj
    9.5
  4. 4LjubljanaLjubljana
    9.0
  5. 5KoperUrban Municipality of Koper
    8.9
  6. 6Novo MestoUrban Municipality of Novo Mesto
    8.8
  7. 6MariborUrban Municipality of Maribor
    8.8
  8. 8TrbovljeMunicipality of Trbovlje
    8.3
Good0–5
Fair6–15
Moderate16–50
Poor51–90
Very poor91–140
Extremely poor141+

The European Environment Agency's air quality index bands for PM2.5 (2024 revision); it has bands, not numbers, so values stay in µg/m³. 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

Use this board

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

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.