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permissible exposure limit (PEL) definition

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1 : a time-weighted average exposure limit (typically 8 hours) or a ceiling exposure limit for employees to any material listed in Occupational Safety and Health Administration (OSHA) Regulation 29 CFR, Air Contaminants. 2 : the maximum permitted eight-hour time-weighted average concentration of an airborne contaminant. The maximum permitted time-weighted average exposures to be used are those published in 29 CFR 1910, Subpart Z. [SEMI S2-93]

See also:

Phase Diagram definition
Peptoid definition
Periplanar definition
Periodicity definition
phosphanes definition