Ball-mill noise became a matter of general concern with passage of the Walsh-Healy Act in 1969. This act is now a part of the broader safety act known as the Occupational Safety and Health Administration. Noise is one of the ``newest pollutants'' in terms of the definition set forth in the Walsh-Healy Act. Studies are currently underway to establish standards by which to determine conformity with, or violation of, the act.
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A 1973 study studied this question.
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