The U.S. Mine Safety and Health Administration (MSHA) announced it is temporarily delaying its respirable coal mine dust sampling because of a newly discovered interference issue between the sampling devices and proximity protection systems.

Also on hold is the requirement that coal mine operators conduct respirable coal mine dust sampling in areas where both the sampling device and the proximity detection system are used at the same time. Agency officials said the interference issue is being actively analyzed. A notice will be issued when dust sampling can resume. Any questions about the delay or the issue can be directed to