SmogRank / Countries / Switzerland / April 2026

Most polluted cities in Switzerland, April 2026

6 cities in Switzerland ranked by their average PM2.5 over the 30 days. Worst: Bellinzona at 8.9 µg/m³, #848 of 2,283 cities in the world. Cleanest: Basel at 6.7. A city needs measurements on 70% of the days to be ranked.

  1. 1BellinzonaTicino
    8.9
  2. 2LuganoTicino
    8.6
  3. 3BernBern
    7.2
  4. 4Winterthurlow-cost sensorsZurich
    7.0
  5. 5ZürichZurich
    6.8
  6. 6BaselBasel-City
    6.7
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, April 2026 · Switzerland now