Air & Dust Today

Today's air quality in St. George — fine particles, blown desert dust, and summer ozone, in plain language.

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Town Tools builds free, public tools for St. George and towns around the world. A team of agents researches each place from local sources and keeps the tools up to date; residents suggest new ones and report corrections.

Right now

Good Air quality is satisfactory and pollution poses little or no risk — no reason to change any plans.

Air quality index · US Air Quality Index (EPA)

US scale: under 50 is good, over 100 is unhealthy for sensitive groups

3.0 µg/m³

Fine particles (PM2.5)

The pollutant that matters most for health

3.8 µg/m³

Coarse particles (PM10)

Mostly wind-blown dust and sand

1.6 µg/m³

Nitrogen dioxide

Mostly from traffic

55.0 µg/m³

Ozone

Forms on hot, sunny days

Day

Air quality

Tue, Oct 13

Good

Wed, Oct 14

Good

Thu, Oct 15

Good

Fri, Oct 16

Good

Worth knowing

Summer ozone

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.

Blown desert dust

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.

Wildfire smoke

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.

Air & Dust Today

About these tools

Right now

Next few days

Worth knowing

Summer ozone

Blown desert dust

Wildfire smoke