SmogRank / Countries / Switzerland / August 2025

Most polluted cities in Switzerland, August 2025

6 cities in Switzerland ranked by their average PM2.5 over the 31 days. Worst: Winterthur at 15.1 µg/m³, #220 of 2,289 cities in the world. Cleanest: Lugano at 8.1. A city needs measurements on 70% of the days to be ranked.

  1. 1Winterthurlow-cost sensorsZurich
    15.1
  2. 2BernBern
    10.5
  3. 2BellinzonaTicino
    10.5
  4. 4ZürichZurich
    9.6
  5. 5BaselBasel-City
    9.4
  6. 6LuganoTicino
    8.1
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, August 2025 · Switzerland now