Worst air pollution Altdorf, today and tomorrow
Today (16 July): Air quality in Altdorf is fair. NO2 is fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 PM (O3: 40.4/100).
Tomorrow (17 July 2026): Air quality in Altdorf is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 12:00 AM (NO2: 36.5/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Altdorf's air quality reflects its enclosed Reuss valley position at the Gotthard route's northern gateway, with vehicle traffic on the A2 motorway — a major Alpine transit corridor — contributing local NOx.
Today - 16 July | Pollution peaks at 12:00
AQI:
Medium
40.4/100
PM2.5 (fine particles):
Good
9.6/100
PM10 (coarse particles):
Good
4.7/100
NO2 (nitrogen dioxide):
Fair
35.5/100
O3 (ozone):
Medium
40.4/100
SO2 (sulfur dioxide):
Good
1.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.9/100
PM1 (ultrafine particles):
Good
10.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 00:00
AQI:
Fair
36.5/100
PM2.5 (fine particles):
Good
9.2/100
PM10 (coarse particles):
Good
7.0/100
NO2 (nitrogen dioxide):
Fair
36.5/100
O3 (ozone):
Fair
33.1/100
SO2 (sulfur dioxide):
Good
2.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.7/100
PM1 (ultrafine particles):
Good
9.9/100
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Frequently Asked Questions
Is air quality bad in Altdorf right now?
On 16 July 2026, overall air quality in Altdorf is fair. NO2 is the main pollutant at 35.5/100. Pollution peaks around 12:00 PM (O3: 40.4/100).
Will air quality be worse tomorrow in Altdorf?
On 17 July 2026, air quality conditions in Altdorf will be similar to today, with AQI forecast at fair at 36.5/100. Pollution peaks around 12:00 AM (NO2: 36.5/100).
When is air pollution at its worst in Altdorf?
Calm winter mornings are when Altdorf's air quality suffers most, with vehicle traffic and lake-season tourism sitting close to the shoreline instead of dispersing as they normally would. The rest of the year sees much better conditions around this lake basin, with summer's ozone spikes limited to the hottest, stillest days.
Are air quality levels in Altdorf 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.
Want to see air quality forecasts for other cities in Switzerland?
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app