Worst air pollution St. George, today and tomorrow

On 30 August 2026, overall air quality in St. George is fair. AQI is the main air quality indicator at 32.1/100. Pollution peaks around 4:00 AM (O3: 32.1/100).

On 31 August 2026, air quality conditions in St. George will be similar to today, with AQI forecast at fair at 28.8/100. Pollution peaks around 9:00 AM (O3: 28.8/100).

Conditions in St. George vary noticeably across the seasons: autumn is often the cleanest stretch, between wildfire season and the onset of winter inversions, but summer brings regional wildfire smoke, while winter brings its own inversion-driven pollution episodes. Valley and basin locations are especially prone to these winter inversion episodes compared to more exposed, higher terrain.

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.