SmogRank / Countries / Switzerland / August 2026

Most polluted cities in Switzerland, August 2026

6 cities in Switzerland ranked by their average PM2.5 over the 31 days. Worst: Bellinzona at 13.6 µg/m³, #298 of 2,312 cities in the world. Cleanest: Winterthur at 7.4. A city needs measurements on 70% of the days to be ranked.

  1. 1BellinzonaTicino
    13.6
  2. 2LuganoTicino
    8.8
  3. 3BernBern
    8.6
  4. 4BaselBasel-City
    7.6
  5. 5ZürichZurich
    7.4
  6. 5Winterthurlow-cost sensorsZurich
    7.4
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 2026 · Switzerland now