SmogRank / Countries / Switzerland / March 2025

Most polluted cities in Switzerland, March 2025

6 cities in Switzerland ranked by their average PM2.5 over the 31 days. Worst: Winterthur at 22.5 µg/m³, #275 of 2,218 cities in the world. Cleanest: Lugano at 9.2. A city needs measurements on 70% of the days to be ranked.

  1. 1Winterthurlow-cost sensorsZurich
    22.5
  2. 2BaselBasel-City
    11.5
  3. 3BernBern
    10.4
  4. 4ZürichZurich
    10.2
  5. 5BellinzonaTicino
    9.5
  6. 6LuganoTicino
    9.2
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, March 2025 · Switzerland now

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SmogRank, most polluted cities in Switzerland, PM2.5, March 2025, smogrank.com/ch/history/2025-03 (accessed 2 Oct 2026).

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