What is the air quality in Mariehamn?

Mariehamn, Åland Islands has an annual US AQI of 36 (Reasonable) and average PM2.5 of 5.6 µg/m³, ranking #151 of 5856 cities. Main pollutant: O3.

What is the cleanest month in Mariehamn?

October is typically the cleanest month (AQI 32) and April the most polluted (AQI 40).

PM2.5: 1998–2024 (satellite). From satellite data, because no government monitor covers the city. Full sources are on the methodology page.

Global rank	City	Continent	AQI	PM2.5
151	Mariehamn, Åland Islands	Europe	AQI 36	PM2.5 5.6 µg/m³