SmogRank / Countries / Switzerland / June 2025
Most polluted cities in Switzerland, June 2025
1 city in Switzerland ranked by their average PM2.5 over the 30 days. Worst: Winterthur at 16.0 µg/m³, #209 of 1,912 cities in the world. A city needs measurements on 70% of the days to be ranked.
- 1Winterthurlow-cost sensorsZurich 16.0
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+