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Several organizations publish occupational exposure limits (OELs) including the Occupational Safety and Health Administration's (OSHA) permissible exposure limits (PELs), the American Conference of Governmental Industrial Hygienists' (ACGIH) threshold limit values (TLVs), and the National Institute for Occupational Safety and Health's (NIOSH) recommended exposure limits (RELs). Only OSHA's PELs are legally enforceable. Discuss why you would only use the OSHA PEL at a facility where you were the safety officer, or alternatively, why you would choose to use one of the other OELs or a combination of the OELs.