Worst air pollution Saguenay, today and tomorrow

On 9 August 2026, overall air quality in Saguenay is fair. O3 is the main pollutant at 31.0/100. Pollution peaks around 12:00 AM (NO2: 41.6/100).

On 10 August 2026, air quality conditions in Saguenay will be similar to today, with AQI forecast at fair at 27.8/100. Pollution peaks around 1:00 PM (O3: 27.8/100).

Air quality in Saguenay shifts noticeably across the seasons, shaped by its aluminum smelters and position deep in the boreal Saguenay valley. For much of the year the air is clean and forest-fresh, but summer and early autumn carry real risk of smoke episodes when wildfires burn nearby or further north. Wind direction across the river determines how much of the industrial output drifts into town on any given day.

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.