Worst air pollution Oyonnax, today and tomorrow
Today (30 August): Air quality in Oyonnax is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 AM (NO2: 34.9/100).
Tomorrow (31 August 2026): Air quality in Oyonnax is fair. All pollutants stay as today. Pollution peaks around 4:00 PM (O3: 23.7/100). Airmine updates local air quality forecasts four times daily.
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Air quality in Oyonnax reflects valley motorway traffic and light industry as the main local source, alongside its setting near the Rhone, and mountain valley winds alternate with calm temperature inversions, which helps maintain reasonable air quality across the year. Winter is typically the worst season, as cold air settles in the valleys and traps traffic and heating emissions for days at a time; summer sees better dispersion but occasional ozone build-up in the lower valleys.
Today - 30 August | Pollution peaks at 07:00
AQI:
Fair
34.9/100
PM2.5 (fine particles):
Good
8.8/100
PM10 (coarse particles):
Good
2.8/100
NO2 (nitrogen dioxide):
Fair
34.9/100
O3 (ozone):
Fair
27.2/100
SO2 (sulfur dioxide):
Good
1.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.3/100
PM1 (ultrafine particles):
Good
9.5/100
Levels show the poorest local air quality during the day
Tomorrow - 31 August | Pollution peaks at 16:00
AQI:
Fair
23.7/100
PM2.5 (fine particles):
Good
5.8/100
PM10 (coarse particles):
Good
2.1/100
NO2 (nitrogen dioxide):
Fair
23.2/100
O3 (ozone):
Fair
23.7/100
SO2 (sulfur dioxide):
Good
1.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
4.5/100
Pollen forecast in Oyonnax
View pollen forecastFrequently Asked Questions
Is air quality bad in Oyonnax right now?
On 30 August 2026, overall air quality in Oyonnax is fair. AQI is the main air quality indicator at 34.9/100. Pollution peaks around 7:00 AM (NO2: 34.9/100).
Will air quality be worse tomorrow in Oyonnax?
On 31 August 2026, air quality conditions in Oyonnax will be similar to today, with AQI forecast at fair at 23.7/100. Pollution peaks around 4:00 PM (O3: 23.7/100).
When is air pollution at its worst in Oyonnax?
The days that hit sensitive groups hardest in Oyonnax are calm spring ones, when valley motorway traffic and light industry and the birch and oak pollen peak overlap; mountain valley winds alternate with calm temperature inversions, so relief usually isn't far behind.
Are air quality levels in Oyonnax 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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