Worst air pollution Sierre, today and tomorrow
Today (16 July): Air quality in Sierre is fair. O3 is fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 AM (NO2: 40.2/100).
Tomorrow (17 July 2026): Air quality in Sierre is fair. AQI worsens to fair; NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 PM (NO2: 39.5/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Use our Strava plugin to check your own exposure.
Sierre's air quality reflects its enclosed Rhône valley position in Switzerland's sunniest and driest region, with vehicle traffic on the A9 motorway contributing local sources under frequent valley temperature inversions.
Today - 16 July | Pollution peaks at 06:00
AQI:
Medium
40.2/100
PM2.5 (fine particles):
Good
16.3/100
PM10 (coarse particles):
Good
7.9/100
NO2 (nitrogen dioxide):
Medium
40.2/100
O3 (ozone):
Fair
37.8/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.7/100
PM1 (ultrafine particles):
Good
16.5/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 23:00
AQI:
Fair
39.5/100
PM2.5 (fine particles):
Good
13.7/100
PM10 (coarse particles):
Good
13.4/100
NO2 (nitrogen dioxide):
Fair
39.5/100
O3 (ozone):
Fair
36.4/100
SO2 (sulfur dioxide):
Good
2.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Good
7.9/100
Pollen forecast in Sierre
View pollen forecastFrequently Asked Questions
Is air quality bad in Sierre right now?
On 16 July 2026, overall air quality in Sierre is fair. O3 is the main pollutant at 37.8/100. Pollution peaks around 6:00 AM (NO2: 40.2/100).
Will air quality be worse tomorrow in Sierre?
On 17 July 2026, air quality conditions in Sierre will be similar to today, with AQI forecast at fair at 39.5/100. Pollution peaks around 11:00 PM (NO2: 39.5/100).
When is air pollution at its worst in Sierre?
Sierre sees its worst air quality when winter calm lets vehicle traffic and orchard and vineyard machinery pool along the Rhone, held in by the valley's steep, enclosing walls. The rest of the year sees much better conditions in this dry valley, with summer's ozone spikes limited to the hottest, stillest afternoons.
Are air quality levels in Sierre 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?
Check air quality in other popular cities:
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