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ACGIH (American Conference of Governmental
Industrial Hygienist) ( . . 1938)
MAC (Maximum Allowable Concentration)
( . . 1946)
TLV (Threshold Limit Value) ( . . 1948)
BEI (Biological Exposure Indices)
OSHA (Occupational Safety and Health
Administration) ( . . 1971)
PEL (Permissible Exposure Limit)
NIOSH (National Institute for Occupational
Safety and Health)
REL (Recommended Exposure Level)
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