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, #678 of 1,105 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
    11.7×
  2. 2LuganoTicino
    11.6×
  3. 2BernBern
    11.6×
  4. 4BaselBasel-City
    11.4×
  5. 5ZürichZurich
    11.4×
Low1–3
Moderate4–6
High7–9
Very high10

The UK's Daily Air Quality Index (1 to 10), PM2.5 bands. 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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