SmogRank / Cleaner or dirtier / Finland
Finland: cleaner or dirtier, 2025
In Finland, 13 cities have enough days in both years to compare 2025 with the same days of 2024: 11 got dirtier and 1 cleaner.
The 11 cities that got dirtier, biggest rise first
| # | City | 2024 | 2025 | Change |
|---|---|---|---|---|
| 1 | LappeenrantaSouth Karelia, Finland | 27 | 34 | +1.3 µg/m³+27% |
| 2 | LohjaUusimaa, Finland | 25 | 32 | +1.2 µg/m³+27% |
| 3 | LaaksolahtiUusimaa, Finland | 32 | 37 | +0.9 µg/m³+16% |
| 4 | MyyrmäkiUusimaa, Finland | 32 | 37 | +0.9 µg/m³+16% |
| 5 | KallahtiUusimaa, Finland | 27 | 31 | +0.8 µg/m³+17% |
| 6 | HelsinkiUusimaa, Finland | 32 | 35 | +0.6 µg/m³+11% |
| 7 | KlaukkalaUusimaa, Finland | 22 | 26 | +0.6 µg/m³+15% |
| 8 | HämeenkyläUusimaa, Finland | 22 | 26 | +0.6 µg/m³+15% |
| 9 | LahtiPaijat-Hame, Finland | 26 | 29 | +0.5 µg/m³+11% |
| 10 | VantaaUusimaa, Finland | 31 | 33 | +0.4 µg/m³+7% |
| 11 | OuluNorth Ostrobothnia, Finland | 25 | 27 | +0.3 µg/m³+7% |
The one city that got cleaner
| # | City | 2024 | 2025 | Change |
|---|---|---|---|---|
| 1 | PoriSatakunta, Finland | 33 | 32 | −0.2 µg/m³−3% |
Means in US AQI over the days a city was measured in both years, the same calendar days each year; a city needs 55% of the days paired, and at least 30. The change is in µg/m³ and per cent. How we compare.
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
Updated 2026-10-07 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.