Worst air pollution Kreis 1 (Altstadt) - Zürich, today and tomorrow
Today (30 August): Air quality in Kreis 1 (Altstadt) is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 AM (NO2: 39.9/100).
Tomorrow (31 August 2026): Air quality in Kreis 1 (Altstadt) is moderate. AQI worsens to moderate; NO2 increases to moderate; all other pollutants stay as today. Pollution peaks around 1:00 AM (NO2: 40.6/100). Airmine updates local air quality forecasts four times daily.
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Kreis 1's air quality reflects Zürich's densest historic core, with pedestrian zones limiting through-traffic while surrounding Limmatquai and Bahnhofstrasse traffic contribute background emissions to this central district.
Today - 30 August | Pollution peaks at 02:00
AQI:
Fair
39.9/100
PM2.5 (fine particles):
Good
10.6/100
PM10 (coarse particles):
Good
3.1/100
NO2 (nitrogen dioxide):
Fair
39.9/100
O3 (ozone):
Fair
27.6/100
SO2 (sulfur dioxide):
Good
1.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.5/100
PM1 (ultrafine particles):
Good
13.6/100
Levels show the poorest local air quality during the day
Tomorrow - 31 August | Pollution peaks at 01:00
AQI:
Moderate
40.6/100
PM2.5 (fine particles):
Good
12.3/100
PM10 (coarse particles):
Good
3.6/100
NO2 (nitrogen dioxide):
Moderate
40.6/100
O3 (ozone):
Fair
25.0/100
SO2 (sulfur dioxide):
Good
1.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.6/100
PM1 (ultrafine particles):
Good
16.2/100
Other Landmarks in Zürich
Sports venues in Zürich
Frequently Asked Questions
Is air quality bad in Kreis 1 (Altstadt) right now?
On 30 August 2026, overall air quality in Kreis 1 (Altstadt) is fair. AQI is the main air quality indicator at 39.9/100. Pollution peaks around 2:00 AM (NO2: 39.9/100).
Will air quality be worse tomorrow in Kreis 1 (Altstadt)?
On 31 August 2026, air quality conditions in Kreis 1 (Altstadt) will be worse than today, with AQI forecast at moderate at 40.6/100. Pollution peaks around 1:00 AM (NO2: 40.6/100).
When is air pollution at its worst in Kreis 1 (Altstadt)?
Kreis 1 (Altstadt)'s poorest air quality shows up when winter calm lets vehicle traffic and dense urban activity accumulate near the lakeshore rather than clearing out with the usual breeze. From spring, conditions steadily pick up, and summer stays mostly clear aside from a rare ozone spike in prolonged heat, with autumn usually just as settled.
Are air quality levels in Kreis 1 (Altstadt) 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: 30 August 2026 at 20:26 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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