Because of a recently discovered interference problem between proximity detection systems and respirable dust sampling devices, MSHA is temporarily delaying its own respirable coal mine dust sampling, and 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. MSHA is actively analyzing the interference problem and will issue a notice as soon as dust sampling is to resume. If you have questions or concerns, please email zzMSHA-CoalHealth@DOL.GOV
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