SmogRank / Countries / Switzerland / November 2025

Most polluted cities in Switzerland, November 2025

5 cities in Switzerland ranked by their average PM2.5 over the 30 days. Worst: Winterthur at 14.2 µg/m³, #396 of 2,173 cities in the world. Cleanest: Zürich at 8.7. A city needs measurements on 70% of the days to be ranked.

  1. 1Winterthurlow-cost sensorsZurich
    14.2
  2. 2BellinzonaTicino
    10.0
  3. 3BaselBasel-City
    9.4
  4. 4LuganoTicino
    9.1
  5. 5ZürichZurich
    8.7
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, November 2025 · Switzerland now