SmogRank / Countries / Switzerland / 2026

Most polluted cities in Switzerland, 2026

6 cities in Switzerland ranked by their average PM2.5 so far (273 of 365 days); 6 above the WHO annual guideline (5.0 µg/m³). Worst: Bellinzona at 12.2 µg/m³, #419 of 2,181 cities in the world. Cleanest: Basel at 8.6. A city needs measurements on 70% of the days to be ranked.

  1. 1BellinzonaTicino
    12.22.4×
  2. 2Winterthurlow-cost sensorsZurich
    10.52.1×
  3. 2LuganoTicino
    10.52.1×
  4. 4ZürichZurich
    9.01.8×
  5. 5BernBern
    8.91.8×
  6. 6BaselBasel-City
    8.61.7×
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, 2026 · Switzerland now