SmogRank / Cleaner or dirtier / Finland
Finland: cleaner or dirtier, 2026
In Finland, 15 cities have enough days in both years to compare 2026 so far (1 January to 6 October) with the same days of 2025: 4 got dirtier and 9 cleaner.
The 4 cities that got dirtier, biggest rise first
| # | City | 2025 | 2026 | Change |
|---|---|---|---|---|
| 1 | PoriSatakunta, Finland | 33 | 35 | +0.4 µg/m³+7% |
| 2 | VantaaUusimaa, Finland | 34 | 36 | +0.3 µg/m³+5% |
| 3 | LohjaUusimaa, Finland | 32 | 32 | +0.1 µg/m³+2% |
| 4 | KallahtiUusimaa, Finland | 32 | 32 | +0.1 µg/m³+2% |
The 9 cities that got cleaner, biggest fall first
| # | City | 2025 | 2026 | Change |
|---|---|---|---|---|
| 1 | OuluNorth Ostrobothnia, Finland | 27 | 23 | −0.7 µg/m³−14% |
| 2 | JyväskyläCentral Finland, Finland | 32 | 28 | −0.7 µg/m³−12% |
| 3 | LappeenrantaSouth Karelia, Finland | 36 | 32 | −0.7 µg/m³−11% |
| 4 | KuopioNorth Savo, Finland | 30 | 27 | −0.5 µg/m³−9% |
| 5 | HämeenkyläUusimaa, Finland | 27 | 26 | −0.1 µg/m³−2% |
| 6 | KlaukkalaUusimaa, Finland | 27 | 26 | −0.1 µg/m³−2% |
| 7 | LahtiPaijat-Hame, Finland | 31 | 31 | −0.1 µg/m³−2% |
| 8 | MyyrmäkiUusimaa, Finland | 39 | 38 | −0.1 µg/m³−1% |
| 9 | LaaksolahtiUusimaa, Finland | 39 | 38 | −0.1 µg/m³−1% |
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.