SmogRank / World / Switzerland / 2023

Most polluted cities in Switzerland, 2023

5 cities in Switzerland ranked by their average PM2.5 over the 365 days; 5 above the WHO annual guideline (5.0 µg/m³). Worst: Bellinzona at 8.3 µg/m³, #569 of 969 cities in the world. Cleanest: Zürich at 6.9. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 56 of these 365 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.

← Bellinzona 8.3 WHO annual guideline
Every city in Switzerland ranked for 2023, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1BellinzonaTicino
    461.7×
  2. 2LuganoTicino
    431.6×
  3. 2BernBern
    431.6×
  4. 4BaselBasel-City
    401.4×
  5. 5ZürichZurich
    381.4×
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, 2023 · Switzerland now

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SmogRank, most polluted cities in Switzerland, PM2.5, 2023, smogrank.com/ch/history/2023 (accessed 2 Oct 2026).

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