As burning asphalt poured a plume of black smoke over Douglas County on April 26, a 15,000-pound chemical bomb was ticking. If everything had gone wrong that tense day, a vapor cloud of toxic hydrogen ...
Ten miles south of downtown St. Paul, on the banks of the Mississippi River, sits an oil refinery that is by far the largest repository of hydrogen fluoride in Minnesota. In the nearly 80 years the ...
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