Worst air pollution St. George, today and tomorrow
Today (9 August): Air quality in St. George is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (O3: 28.1/100).
Tomorrow (10 August 2026): Air quality in St. George is fair. All pollutants stay as today. Pollution peaks around 8:00 AM (O3: 35.5/100). Airmine updates local air quality forecasts four times daily.
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St. George's air quality in Utah reflects the Virgin River valley's partial topographic enclosure between the Pine Valley Mountains and the Red Cliffs desert landscape, with vehicle emissions from I-15 and the surrounding rapid residential and tourism development contributing local sources. Winter temperature inversions in the Washington County basin can concentrate vehicle and wood-burning emissions, while summer ozone from vehicle traffic and the intense Utah desert heat are the primary warm-season concerns in this rapidly growing southwestern Utah gateway city.
Today - 9 August | Pollution peaks at 10:00
AQI:
Fair
28.1/100
PM2.5 (fine particles):
Good
12.9/100
PM10 (coarse particles):
Good
4.9/100
NO2 (nitrogen dioxide):
Good
3.1/100
O3 (ozone):
Fair
28.1/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Good
8.8/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 08:00
AQI:
Fair
35.5/100
PM2.5 (fine particles):
Good
14.5/100
PM10 (coarse particles):
Good
5.8/100
NO2 (nitrogen dioxide):
Good
3.1/100
O3 (ozone):
Fair
35.5/100
SO2 (sulfur dioxide):
Good
2.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.1/100
PM1 (ultrafine particles):
Good
9.6/100
Pollen forecast in St. George
View pollen forecastFrequently Asked Questions
Is air quality bad in St. George right now?
On 9 August 2026, overall air quality in St. George is fair. AQI is the main air quality indicator at 28.1/100. Pollution peaks around 10:00 AM (O3: 28.1/100).
Will air quality be worse tomorrow in St. George?
On 10 August 2026, air quality conditions in St. George will be similar to today, with AQI forecast at fair at 35.5/100. Pollution peaks around 8:00 AM (O3: 35.5/100).
When is air pollution at its worst in St. George?
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.
Are air quality levels in St. George based on measurements or forecasts?
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.
Why doesn’t the forecast always reflect wildfire impacts?
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.
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Data provided by Airmine — Last update: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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