Worst air pollution Portland West, today and tomorrow

On 25 August 2026, overall air quality in Portland West is good. AQI is the main air quality indicator at 15.6/100. Pollution peaks around 3:00 PM (O3: 15.6/100).

On 26 August 2026, air quality conditions in Portland West will be similar to today, with AQI forecast at good at 16.6/100. Pollution peaks around 12:00 PM (O3: 16.6/100).

Particulate levels here tend to peak during the coldest months of the year, when wood heater use and gas heating rise just as calm, cold air traps the smoke locally. By summer, periodic bushfire smoke becomes the more pressing issue in this area, which can settle over the area for days at a time when nearby bushfires are burning, on top of routine ozone from heat and sunlight.

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.