Worst air pollution Rimouski, today and tomorrow

On 30 August 2026, overall air quality in Rimouski is good. AQI is the main air quality indicator at 19.7/100. Pollution peaks around 12:00 PM (O3: 19.7/100).

On 31 August 2026, air quality conditions in Rimouski will be worse than today, with AQI forecast at fair at 26.4/100. Pollution peaks around 11:00 PM (NO2: 26.4/100).

Seasonal air quality in Rimouski is closely linked to its position along the widening St. Lawrence estuary. Spring planting and fall harvest can raise dust levels briefly, while summer heat occasionally pushes up ground-level ozone; winter usually brings the cleanest, calmest air of the year. Away from the main roads, air quality generally stays good even during the busier farming months.

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.