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

On 9 August 2026, overall air quality in Uptown 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 Uptown 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).

Uptown Saint John's air quality shifts with the calendar, largely because of its harbourside core near the Irving Oil refinery. Summer heat can worsen conditions when plant emissions combine with sunlight to form ground-level ozone, while winter inversions occasionally trap industrial pollutants close to the ground on still, cold days. 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.