What is the air quality in St. Gallen?

St. Gallen, Switzerland has an annual US AQI of 57 (Reasonable) and average PM2.5 of 11.7 µg/m³, ranking #1541 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in St. Gallen?

September is typically the cleanest month (AQI 49) and January the most polluted (AQI 64).

Where does St. Gallen's air quality data come from?

PM2.5: 1998–2026 (satellite 1998–2024, model 2025–2026). From satellite data, because no government monitor covers the city. Full sources are on the methodology page.

St. Gallen, Switzerland — Air Quality & Clean City Guide 2026

St. Gallen Air Quality Data

Global rank	City	Continent	AQI	PM2.5
1541	St. Gallen, Switzerland	Europe	AQI 57	PM2.5 11.7 µg/m³