SmogRank / World / Switzerland / October 2024
Most polluted cities in Switzerland, October 2024
1 city in Switzerland ranked by their average PM2.5 over the 31 days. The only one: Winterthur at 11.4 µg/m³, #397 of 1,966 cities in the world. A city needs measurements on 70% of the days to be ranked.
Switzerland has 9 cities ranked over the last 30 days, but only 1 here: most of its monitors have no readings for October 2024 in OpenAQ's archive, where ours come from, or too few to rank. Cities missing from this board weren't clean, just not measured.
- 1Winterthurlow-cost sensorsZurich 55
Low-cost sensors: consumer units, counted only in cities with no government-grade monitor; they read close to reference monitors on the whole, but 15 to 25% high in humid air. How we use them.
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 2024 · Switzerland now
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SmogRank, most polluted cities in Switzerland, PM2.5, October 2024, smogrank.com/ch/history/2024-10 (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); RMCAB (Secretaría Distrital de Ambiente, Bogotá); 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.