SmogRank / Countries / Switzerland / January 2026

Most polluted cities in Switzerland, January 2026

6 cities in Switzerland ranked by their average PM2.5 over the 31 days. Worst: Winterthur at 23.7 µg/m³, #204 of 2,047 cities in the world. Cleanest: Bern at 12.5. A city needs measurements on 70% of the days to be ranked.

  1. 1Winterthurlow-cost sensorsZurich
    23.7
  2. 2BellinzonaTicino
    17.5
  3. 3LuganoTicino
    15.6
  4. 4ZürichZurich
    14.3
  5. 5BaselBasel-City
    13.4
  6. 6BernBern
    12.5
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, January 2026 · Switzerland now