SmogRank / Countries / Norway / September 2025

Most polluted cities in Norway, September 2025

16 cities in Norway ranked by their average PM2.5 over the 30 days. Worst: Sarpsborg at 6.6 µg/m³, #1,387 of 2,439 cities in the world. Cleanest: Åsane at 2.6. A city needs measurements on 70% of the days to be ranked.

  1. 1SarpsborgØstfold
    6.6
  2. 2PorsgrunnTelemark
    6.0
  3. 3MossØstfold
    5.4
  4. 4OsloOslo
    5.2
  5. 5KristiansandAgder
    4.9
  6. 6Mo i RanaNordland
    4.8
  7. 6FredrikstadØstfold
    4.8
  8. 8LillehammerInnlandet
    4.5
  9. 9DrammenBuskerud
    4.0
  10. 10GjøvikInnlandet
    3.6
  11. 11TrondheimTrøndelag
    3.3
  12. 11BergenVestland
    3.3
  13. 13NesttunVestland
    3.0
  14. 14HamarInnlandet
    2.9
  15. 14BodøNordland
    2.9
  16. 16ÅsaneVestland
    2.6
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, September 2025 · Norway now