SmogRank / World / Switzerland / October 2026

Most polluted cities in Switzerland, October 2026

3 cities in Switzerland ranked by their average PM2.5 so far (1 of 31 days). Worst: Bellinzona at 23.0 µg/m³, #73 of 1,630 cities in the world. Cleanest: Zürich at 10.9. A city needs measurements on 70% of the days to be ranked.

← Bellinzona 23.0 µg/m³ 20 µg/m³0
Every city in Switzerland ranked for October 2026, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1BellinzonaTicino
    77
  2. 2Winterthurlow-cost sensorsZurich
    64
  3. 3ZürichZurich
    54
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, October 2026 · Switzerland now

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SmogRank, most polluted cities in Switzerland, PM2.5, October 2026 (so far), smogrank.com/ch/history/2026-10 (accessed 2 Oct 2026).

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