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 µg/m³ 7.5 µg/m³5 WHO annual guideline0
Every city in Switzerland ranked for 2023, 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
    8.31.7×
  2. 2LuganoTicino
    7.81.6×
  3. 2BernBern
    7.81.6×
  4. 4BaselBasel-City
    7.21.4×
  5. 5ZürichZurich
    6.91.4×
Good0–5
Fair6–15
Moderate16–50
Poor51–90
Very poor91–140
Extremely poor141+

The European Environment Agency's air quality index bands for PM2.5 (2024 revision); it has bands, not numbers, so values stay in µg/m³. 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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