Today's air quality in St. George — fine particles, blown desert dust, and summer ozone, in plain language.
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A plain-language read on the air over St. George — the fine-particle and dust levels, and in the desert summer, ground-level ozone. Updated through the day.
Fair Fine for being outside, including exercise, for almost everyone.
| Day | Air quality |
|---|---|
| Sat 4 Jul | Moderate |
| Sun 5 Jul | Moderate |
| Mon 6 Jul | Fair |
| Tue 7 Jul | Fair |
Southern Utah's hot, sunny days can cook up ground-level ozone, which irritates the lungs — hardest on children, older adults and anyone with asthma or heart trouble. Utah's Division of Air Quality issues summer Ozone Action Day guidance and monitors ozone here in Washington County; on those days it helps to move hard outdoor exercise to the cooler morning.
From spring through fall, strong winds lift dust off dry desert soils, spiking coarse-particle (PM10) levels and dropping visibility along the I-15 corridor. If the air looks hazy and the wind is up, it's usually dust rather than smoke — the PM10 card above is the one to watch on those days.
In the western fire season, roughly June through September, smoke from regional wildfires — sometimes hundreds of miles away — can drift in and haze the sky. When it does, the fine-particle (PM2.5) reading climbs; the AirNow Fire and Smoke Map shows where the smoke is coming from.
Updated . These are modelled estimates for the area around St. George, not readings from a street monitor — air right beside a busy road can be worse than the area-wide picture. Official forecast: air.utah.gov. Air quality data by Open-Meteo (CC BY 4.0), based on Copernicus CAMS.