Worst air pollution Voiron, today and tomorrow

On 21 July 2026, overall air quality in Voiron is fair. AQI is the main air quality indicator at 39.5/100. Pollution peaks around 5:00 PM (O3: 39.5/100).

On 22 July 2026, air quality conditions in Voiron will be similar to today, with NO2 forecast at fair at 29.0/100. Pollution peaks around 5:00 PM (O3: 41.2/100).

In Voiron, allergy sufferers and those sensitive to pollution both notice more symptoms when valley motorway traffic and light industry coincides with heavy birch and oak pollen; mountain valley winds alternate with calm temperature inversions, keeping bad spells relatively short. Nearby alpine valley pasture and orchards add a further seasonal factor.

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.

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.