Worst air pollution Champsec - Sion, today and tomorrow
Today (16 July): Air quality in Champsec is fair. O3 and PM1 are fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, and HCHO are good. Pollution peaks around 6:00 AM (NO2: 46.0/100).
Tomorrow (17 July 2026): Air quality in Champsec is fair. PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 11:00 PM (NO2: 43.2/100). 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
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Champsec's air quality reflects its position within Sion's enclosed Rhône valley, with vehicle traffic contributing local sources under the valley's frequent inversions and exceptionally dry, sunny climate.
Today - 16 July | Pollution peaks at 06:00
AQI:
Medium
46.0/100
PM2.5 (fine particles):
Good
19.8/100
PM10 (coarse particles):
Good
8.9/100
NO2 (nitrogen dioxide):
Medium
46.0/100
O3 (ozone):
Fair
37.9/100
SO2 (sulfur dioxide):
Good
2.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.5/100
PM1 (ultrafine particles):
Fair
20.7/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 23:00
AQI:
Medium
43.2/100
PM2.5 (fine particles):
Good
14.2/100
PM10 (coarse particles):
Good
14.0/100
NO2 (nitrogen dioxide):
Medium
43.2/100
O3 (ozone):
Fair
34.8/100
SO2 (sulfur dioxide):
Good
2.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
9.1/100
Other Landmarks in Sion
Frequently Asked Questions
Is air quality bad in Champsec right now?
On 16 July 2026, overall air quality in Champsec is fair. O3 is the main pollutant at 37.9/100. Pollution peaks around 6:00 AM (NO2: 46.0/100).
Will air quality be worse tomorrow in Champsec?
On 17 July 2026, air quality conditions in Champsec will be similar to today, with O3 forecast at fair at 34.8/100. Pollution peaks around 11:00 PM (NO2: 43.2/100).
When is air pollution at its worst in Champsec?
Champsec's poorest air quality tends to show up when winter stillness lets vehicle traffic and orchard and vineyard machinery build up in the valley rather than dispersing. Warmer months bring noticeably better airflow through this dry valley, with only the occasional summer ozone spike breaking an otherwise clean pattern through spring and autumn.
Are air quality levels in Champsec 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