SmogRank / Countries / Finland / September 2025

Most polluted cities in Finland, September 2025

12 cities in Finland ranked by their average PM2.5 over the 30 days. Worst: Helsinki at 6.3 µg/m³, #1,497 of 2,439 cities in the world. Cleanest: Tampere at 4.0. A city needs measurements on 70% of the days to be ranked.

  1. 1HelsinkiUusimaa
    6.3
  2. 2LappeenrantaSouth Karelia
    5.9
  3. 3PoriSatakunta
    5.6
  4. 3MyyrmäkiUusimaa
    5.6
  5. 5VantaaUusimaa
    5.2
  6. 6LohjaUusimaa
    5.0
  7. 7LahtiPaijat-Hame
    4.8
  8. 7JyväskyläCentral Finland
    4.8
  9. 9KlaukkalaUusimaa
    4.7
  10. 10OuluNorth Ostrobothnia
    4.5
  11. 11KuopioNorth Savo
    4.2
  12. 12TamperePirkanmaa
    4.0
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 · Finland now

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SmogRank, most polluted cities in Finland, PM2.5, September 2025, smogrank.com/fi/history/2025-09 (accessed 2 Oct 2026).

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