Worst air pollution Zürich, today and tomorrow
Today (20 September): Air quality in Zürich is moderate. AQI, NO2, O3, and PM1 are moderate; PM2.5 and PM10 are fair; SO2, CO, and HCHO are good. Pollution peaks around 8:00 AM (PM1: 46.5/100).
Tomorrow (21 September 2026): Air quality in Zürich is moderate. O3 decreases to fair; all other pollutants stay as today. Pollution peaks around 8:00 AM (NO2: 41.9/100). Airmine updates local air quality forecasts four times daily.
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Zürich's air quality is generally good for a major European financial centre, benefiting from the Lake Zürich corridor and the surrounding Mittelland providing consistent ventilation from the west. Vehicle traffic on the A1 and surrounding cantonal road network contributes the primary local emissions, while wood burning adds seasonal PM2.5 in winter and the Alpine Föhn wind periodically delivers outstanding clean mountain air to the city.
Today - 20 September | Pollution peaks at 08:00
AQI:
Moderate
46.5/100
PM2.5 (fine particles):
Fair
27.9/100
PM10 (coarse particles):
Fair
23.1/100
NO2 (nitrogen dioxide):
Moderate
44.6/100
O3 (ozone):
Moderate
41.6/100
SO2 (sulfur dioxide):
Good
0.8/100
CO (carbon monoxide):
Good
1.0/100
HCHO (formaldehyde):
Good
4.6/100
PM1 (ultrafine particles):
Moderate
46.5/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 08:00
AQI:
Moderate
41.9/100
PM2.5 (fine particles):
Fair
22.7/100
PM10 (coarse particles):
Fair
20.7/100
NO2 (nitrogen dioxide):
Moderate
41.9/100
O3 (ozone):
Fair
28.3/100
SO2 (sulfur dioxide):
Good
0.8/100
CO (carbon monoxide):
Good
0.8/100
HCHO (formaldehyde):
Good
4.8/100
PM1 (ultrafine particles):
Moderate
41.2/100
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Frequently Asked Questions
Is air quality bad in Zürich right now?
On 20 September 2026, overall air quality in Zürich is moderate. AQI is the main air quality indicator at 46.5/100. Pollution peaks around 8:00 AM (PM1: 46.5/100).
Will air quality be worse tomorrow in Zürich?
On 21 September 2026, air quality conditions in Zürich will be similar to today, with AQI forecast at moderate at 41.9/100. Pollution peaks around 8:00 AM (NO2: 41.9/100).
When is air pollution at its worst in Zürich?
At Zürich, winter brings the poorest readings, as vehicle traffic and dense urban activity build up around the lake basin whenever the usual breeze fails to stir the air. Once spring arrives, dispersion improves steadily, and summer stays largely clear except during rare heatwaves; autumn tends to be another comparatively mild, steady stretch.
Are air quality levels in Zürich based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 20 September 2026 at 20:27 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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