Worst air pollution Altstadt Bern - Bern, today and tomorrow
Today (20 September): Air quality in Altstadt Bern is moderate. AQI, NO2, and PM1 are moderate; PM2.5 and O3 are fair; PM10, SO2, CO, and HCHO are good. Pollution peaks around 2:00 AM (NO2: 41.7/100).
Tomorrow (21 September 2026): Air quality in Altstadt Bern is fair. AQI improves to fair; NO2 decreases to fair; PM1 decreases to fair; all other pollutants stay as today. Pollution peaks around 9:00 AM (PM1: 38.2/100). Airmine updates local air quality forecasts four times daily.
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Altstadt Bern's air quality reflects Bern's dense UNESCO-listed medieval core, with pedestrian arcades limiting through-traffic while surrounding streets and the Aare river's gorge setting concentrate emissions somewhat.
Today - 20 September | Pollution peaks at 02:00
AQI:
Moderate
41.7/100
PM2.5 (fine particles):
Fair
33.4/100
PM10 (coarse particles):
Good
18.1/100
NO2 (nitrogen dioxide):
Moderate
41.7/100
O3 (ozone):
Fair
32.6/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.8/100
HCHO (formaldehyde):
Good
3.6/100
PM1 (ultrafine particles):
Moderate
40.2/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 09:00
AQI:
Fair
38.2/100
PM2.5 (fine particles):
Fair
31.7/100
PM10 (coarse particles):
Good
17.4/100
NO2 (nitrogen dioxide):
Fair
37.2/100
O3 (ozone):
Fair
27.7/100
SO2 (sulfur dioxide):
Good
0.6/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
3.7/100
PM1 (ultrafine particles):
Fair
38.2/100
Other Landmarks in Bern
Sports venues in Bern
Frequently Asked Questions
Is air quality bad in Altstadt Bern right now?
On 20 September 2026, overall air quality in Altstadt Bern is moderate. AQI is the main air quality indicator at 41.7/100. Pollution peaks around 2:00 AM (NO2: 41.7/100).
Will air quality be worse tomorrow in Altstadt Bern?
On 21 September 2026, air quality conditions in Altstadt Bern will be better than today, with AQI forecast at fair at 38.2/100. Pollution peaks around 9:00 AM (PM1: 38.2/100).
When is air pollution at its worst in Altstadt Bern?
At Altstadt Bern, winter mornings bring the poorest readings, as vehicle traffic and administrative and commuter activity build up in the river valley whenever the usual airflow stalls out overnight. Warmer months bring noticeably better airflow through the valley, with only the occasional summer ozone spike breaking an otherwise clean pattern through spring and autumn.
Are air quality levels in Altstadt Bern 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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