By: Jesse Newman
Wall Street Journal

After an explosion at an Imperial Sugar Co. factory in Georgia killed 14 workers and injured dozens in 2008, U.S. officials promised rules for handling the well-known workplace hazard that caused it: combustible dust.

Six years later, there has been little change. Now, as investigators continue to explore the possibility that dust could have caused the collapse of a feed mill in Omaha, Neb., this past January, the U.S. Occupational Safety and Health Administration is again delaying efforts to make good on that promise,...

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