Worst air pollution Sisters, today and tomorrow

On 9 August 2026, overall air quality in Sisters is fair. PM10 is the main pollutant at 30.0/100. Pollution peaks around 12:00 AM (NO2: 58.0/100).

On 10 August 2026, air quality conditions in Sisters will be worse than today, with AQI forecast at poor at 79.2/100. Pollution peaks around 11:00 PM (NO2: 79.2/100).

Sisters sees air quality change through the year. In short, winter and spring bring the cleanest air, as frequent rain and consistent onshore wind clear pollution quickly, whereas by late summer, wildfire smoke can override the region's usual clean-air advantage for days at a time. Winter temperature inversions can briefly trap wood-smoke in low-lying valleys, but these episodes are usually short-lived.

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.