SmogRank / World / Switzerland / Zurich / 2026
Most polluted cities in Zurich, Switzerland, 2026
2 cities in Zurich, Switzerland ranked by their average PM2.5 so far (281 of 365 days); 2 above the WHO annual guideline (5.0 µg/m³). Worst: Winterthur at 10.5 µg/m³, #886 of 2,754 cities in the world. Cleanest: Zürich at 8.9. A city needs measurements on 70% of the days to be ranked.
- 1Winterthurlow-cost sensors 542.1×
- 2Zürich 491.8×
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, 2026 · All cities in Switzerland, 2026 · Zurich now
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SmogRank, most polluted cities in Zurich, Switzerland, PM2.5, 2026 (so far), smogrank.com/ch/region/zurich/history/2026 (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.