SmogRank / World / Switzerland / Zurich / January 2026
Most polluted cities in Zurich, Switzerland, January 2026
2 cities in Zurich, Switzerland ranked by their average PM2.5 over the 31 days. Worst: Winterthur at 23.7 µg/m³, #287 of 2,593 cities in the world. Cleanest: Zürich at 14.3. A city needs measurements on 70% of the days to be ranked.
- 1Winterthurlow-cost sensors 78
- 2Zürich 61
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, January 2026 · All cities in Switzerland, January 2026 · Zurich now
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SmogRank, most polluted cities in Zurich, Switzerland, PM2.5, January 2026, smogrank.com/ch/region/zurich/history/2026-01 (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.