SmogRank / World / Europe / Switzerland / Zurich
Most polluted cities in Zurich, Switzerland
2 measured cities, last 30 days; 0 above the WHO 24-hour guideline. The most people breathing unhealthy air: Zürich, Switzerland, about 0 on an average day.
About 0 people in this city breathed unhealthy air on an average day over the last 30 days.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
Now: cities by their PM2.5 over the last 24 hours; fires, smoke and ash from Oct 9, the newest day mapped.
- 1Zürich 0
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
Estimated: cities without a monitor
Zurich cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Uster | ≈ 10 µg/m³ |
| Wetzikon | ≈ 10 µg/m³ |
| Horgen | ≈ 12 µg/m³ |
| Opfikon | ≈ 7 µg/m³ |
| Dietikon | ≈ 8 µg/m³ |
| Bülach | ≈ 7 µg/m³ |
| Dübendorf | ≈ 9 µg/m³ |
| Kloten | ≈ 7 µg/m³ |
| Stadt Winterthur (Kreis 1) | ≈ 8 µg/m³ |
| Seen (Kreis 3) | ≈ 8 µg/m³ |
| Adliswil | ≈ 12 µg/m³ |
Bad-air episodes in Zurich
- Europe, 18 to 25 March 20268 days430 cities136 µg/m³peak, Łask
- Europe, 1 to 12 March 202612 days532 cities109 µg/m³peak, Radomsko
- Europe, January and February 202612 January to 12 February 2026, 32 days625 cities252 µg/m³peak, Travnik
- Europe, December 2025 to January 202625 December 2025 to 2 January 2026, 9 days189 cities110 µg/m³peak, Kempten (Allgäu)
- Eastern Europe, 16 to 21 December 20256 days129 cities298 µg/m³peak, Banja Luka
- Europe, 22 to 23 November 20252 days59 cities74 µg/m³peak, Żary
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
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SmogRank, most polluted cities in Zurich, Switzerland, by people breathing unhealthy air, PM2.5, last 30 days to 10 Oct 2026, 05:00 UTC, smogrank.com/ch/region/zurich?w=30d&by=people. 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.
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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.
Updated 2026-10-10 05:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some readings: 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 (why we use them).