SmogRank / Countries / Switzerland / April 2025

Most polluted cities in Switzerland, April 2025

6 cities in Switzerland ranked by their average PM2.5 over the 30 days. Worst: Winterthur at 11.7 µg/m³, #494 of 2,286 cities in the world. Cleanest: Basel at 6.3. A city needs measurements on 70% of the days to be ranked.

  1. 1Winterthurlow-cost sensorsZurich
    11.7
  2. 2BellinzonaTicino
    7.8
  3. 3LuganoTicino
    6.7
  4. 4BernBern
    6.5
  5. 5ZürichZurich
    6.4
  6. 6BaselBasel-City
    6.3
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, April 2025 · Switzerland now