Worst air pollution West Saint John - Saint John, today and tomorrow

On 9 August 2026, overall air quality in West Saint John is fair. AQI is the main air quality indicator at 37.4/100. Pollution peaks around 11:00 AM (O3: 37.4/100).

On 10 August 2026, air quality conditions in West Saint John will be similar to today, with AQI forecast at fair at 34.1/100. Pollution peaks around 12:00 PM (O3: 34.1/100).

West Saint John's air quality changes through the year largely because of its harbourside streets across the Reversing Falls. Air quality here tends to dip in summer, when heat and industrial output combine, and again briefly in winter when cold, calm air traps emissions near ground level. Wind direction along the river has a strong influence on which neighbourhoods feel the effects most 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.