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(KSL News) Utah's largest wildfire is pumping out more than just smoke. Federal officials say the Milford Flat Fire is burning over rocks and releasing high levels of radon.
Radon is a radioactive gas that naturally occurs in geological formations.
Officials say right now there is no health threat to humans.
Meanwhile, fire crews are trying to keep the fire away from I-15. Last night they intentionally burned a small valley west of the highway to get rid of vegetation that could fuel the fire.
The blaze has scorched more than 363,000 acres. It is 65% contained.