SmogRank / Countries / Switzerland / 2025

Most polluted cities in Switzerland, 2025

6 cities in Switzerland ranked by their average PM2.5 over the 365 days; 6 above the WHO annual guideline (5.0 µg/m³). Worst: Winterthur at 15.2 µg/m³, #237 of 2,131 cities in the world. Cleanest: Lugano at 8.9. A city needs measurements on 70% of the days to be ranked.

  1. 1Winterthurlow-cost sensorsZurich
    15.23.0×
  2. 2BellinzonaTicino
    11.12.2×
  3. 3BaselBasel-City
    9.92.0×
  4. 4BernBern
    9.82.0×
  5. 5ZürichZurich
    9.11.8×
  6. 6LuganoTicino
    8.91.8×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, 2025 · Switzerland now