SmogRank / Countries / Switzerland / July 2025

Most polluted cities in Switzerland, July 2025

6 cities in Switzerland ranked by their average PM2.5 over the 31 days. Worst: Winterthur at 8.6 µg/m³, #1,247 of 2,283 cities in the world. Cleanest: Lugano at 4.7. A city needs measurements on 70% of the days to be ranked.

  1. 1Winterthurlow-cost sensorsZurich
    8.6
  2. 2BernBern
    6.3
  3. 3ZürichZurich
    6.2
  4. 3BaselBasel-City
    6.2
  5. 5BellinzonaTicino
    5.9
  6. 6LuganoTicino
    4.7
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, July 2025 · Switzerland now