Federal judges appeared to reject industry arguments against OSHA’s view of the risks posed by silica during oral arguments that could decide the fate of a rule setting tougher limits on worker exposure to the breathable mineral.

A three-judge panel at the U.S. Court of Appeals for the District of Columbia Circuit heard over two hours of arguments Sept. 26 on whether the Occupational Safety and Health Administration showed workers face a significant risk from silica exposure under existing regulations (N. Am.'s Bldg, Trades Unions v. OSHA, D.C. Cir., No. 16-1105, 9/26/17).

“We do...