Air Quality Lab — Mariehamn, Aland Islands
Air Quality Profile·
Mariehamn reports an annual PM2.5 of 4.4 µg/m³. That's below the WHO 2021 annual guideline of 5 µg/m³ — cleaner than most cities on the continent.
Mariehamn
Aland Islands
Aland IslandsAnnual Average
ExcellentWHO annual classification
4.4µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
5.05.0 µg/m³ — Excellent
5.35.3 µg/m³ — Good
5.55.5 µg/m³ — Good
3.93.9 µg/m³ — Excellent
5.05.0 µg/m³ — Excellent
5.35.3 µg/m³ — Good
3.63.6 µg/m³ — Excellent
4.34.3 µg/m³ — Excellent
3.73.7 µg/m³ — Excellent
4.04.0 µg/m³ — Excellent
3.23.2 µg/m³ — Excellent
4.64.6 µg/m³ — Excellent
Jan
Feb
Mar
Apr
May
Jun
5.05.0 µg/m³ — Excellent
5.35.3 µg/m³ — Good
5.55.5 µg/m³ — Good
3.93.9 µg/m³ — Excellent
5.05.0 µg/m³ — Excellent
5.35.3 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
3.63.6 µg/m³ — Excellent
4.34.3 µg/m³ — Excellent
3.73.7 µg/m³ — Excellent
4.04.0 µg/m³ — Excellent
3.23.2 µg/m³ — Excellent
4.64.6 µg/m³ — Excellent
Best months: Jul, Sep, NovWorst months: Feb–Mar, Jun
Excellent0–5 µg/m³Good5–10 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared worldwide
Mariehamn: 4.4 µg/m³. Typical range: 8.9–26.6 µg/m³. Low anchor: Bergen, 4.9 µg/m³. High anchor: Diepsloot, 162.1 µg/m³.
22,874 cities tracked