SmogRank / World / Switzerland / March 2023
Most polluted cities in Switzerland, March 2023
2 cities in Switzerland ranked by their average PM2.5 over the 31 days. Worst: Kreuzlingen at 9.6 µg/m³, #274 of 867 cities in the world. Cleanest: Basel at 9.6. A city needs measurements on 70% of the days to be ranked.
OpenAQ's archive, where our readings come from, has almost none for 20 of these 31 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; many cities elsewhere are missing from this board, not clean. Why.
Switzerland has 9 cities ranked over the last 30 days, but only 2 here: most of its monitors have no readings for March 2023 in OpenAQ's archive, where ours come from, or too few to rank. Cities missing from this board weren't clean, just not measured.
- 1KreuzlingenThurgau 52
- 1BaselBasel-City 52
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, March 2023 · Switzerland now
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Ranked cities in each region, March 2023.
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SmogRank, most polluted cities in Switzerland, PM2.5, March 2023, smogrank.com/ch/history/2023-03 (accessed 10 Oct 2026). Some readings from Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published.
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.