The U.S. Department of Energy declassifies documents showing world's largest mercury pollution event in Oak Ridge, Tennessee (ultimately found to be 4.2 million pounds [1.9 kt]), in response to the Appalachian Observer's Freedom of Information Act request.

The United States Department of Energy (DOE) is an executive department of the U.S. federal government that oversees national energy policy and energy production, the research and development of nuclear power, the military's nuclear weapons program, nuclear reactor production for the United States…