What is the air quality in Sion?

Sion, Switzerland has an annual US AQI of 57 (Reasonable) and average PM2.5 of 12.6 µg/m³, ranking #1629 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Sion?

August is typically the cleanest month (AQI 48) and January the most polluted (AQI 69).

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
1629	Sion, Switzerland	Europe	AQI 57	PM2.5 12.6 µg/m³