TL;DR
Wednesday's storm pushed PM10 particle levels to about four times the healthy threshold, University of Utah researcher Kevin Perry told KSL.
The lakebed contains 13 substances flagged as possible health concerns, arsenic among them, KSL reported.
Metals from the dust turn up in garden vegetables even after washing, according to new Utah State University research.
A dust storm swept through Salt Lake Valley on July 8, carrying particles off the shrinking Great Salt Lake into nearby neighborhoods, KSL reported. The exposed lakebed now covers roughly 800 square miles, per the Great Salt Lake Collaborative. That dust carries arsenic, uranium, lithium and other metals, and researchers say it's becoming a real health concern along the Wasatch Front.
By the Numbers
800 square miles of exposed lakebed, per the Great Salt Lake Collaborative.
1,700 square miles at 4,200 feet: the lake's size at its historic average level, the Utah Division of Water Resources notes.
4,191.1 feet: the south arm's elevation at the end of 2025, the third-lowest on record since 1903, Western Water reported.
3 to 8 dust events happen in a typical year, Perry said, via KSL.
1 in 3 modeled exposure scenarios surpassed the concern threshold for children, USU researchers found in their greenhouse study.
800,000 acre-feet: the water the lake needs to exit "serious adverse effects" status, Great Salt Lake Commissioner Brian Steed said, as reported by Deseret News.
What They're Saying
"It doesn't matter what the dust is made out of," Perry told KSL. High enough PM10 levels alone can send people to the ER and contribute to heart attacks and strokes, he added.
USU watershed sciences professor Janice Brahney, who supervised the food-chain study, connected the risk to daily life here. "Growing food and home gardening is an important part of Utah culture," she said in comments carried by Utah State Today. Researchers, she said, need to confirm the atmosphere isn't adding contaminants to the soil people grow food in.
Why You Should Care
Two risks are stacking up. High PM10 storms can trigger immediate respiratory problems, per Perry. And USU's greenhouse tests found leafy greens absorbed measurable arsenic and uranium from the dust, even after washing. If you garden, hit a farmers market, or just breathe Wasatch Front air during a storm, this affects you.
What's Next
The Utah Division of Air Quality is adding PM10 and PM2.5 monitors in vulnerable communities, KSL noted. A Wilkes Center report released February 12, 2026, led by Perry, reviewed 12 dust control options and concluded restoring lake inflows remains the strongest long-term fix. Separately, University of Utah scientists located a freshwater reservoir more than two miles deep under the lakebed near Farmington Bay, ScienceDaily reported, and are studying whether it could wet down dust hotspots.