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- A level to which it is believed a worker can be exposed day after day for a working lifetime without adverse health effects
- Reference: Chemical Process Safety – Fundamentals with Applications, 2nd Ed., Daniel A. Crowl/Joseph F. Louvar
- A term to express the airborne concentration of a material to which nearly all persons can be exposed day after day without adverse effects. References: The Center for Chemical Process Safety of the American Institute of Chemical Engineers. Safety Health and Loss Prevention in Chemical Processes. 345 East 47th Street, New York, NY 10017, 1990.
- Science/Toxicity/Dose and Response Models