A group of mines in the southwest produce 11% of the mercury emissions in the US -- and clouds of the toxic metal currently threaten Utah.
Congress ordered the EPA to make rules that cut down the amount of mercury in our air. But the rules don't apply to the Elko, Nevada area mines.
Those gold mines pour clouds of mercury into the air. Mercury has been linked to autism, neurological disease, and death. Prevailing winds are carrying the clouds of mercury to the Great Salt Lake region. (WashPost)