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Today's Terms
Aquifer
Definition:
An underground source of water. This water may be contained in a layer of rock, sand or gravel.
Action level
Definition:
The exposure level (the material's concentration in air) at which OSHA regulations to protect employees take effect (29 CFR 1910.1001-1047); e.g., workplace air analysis employee training, medical monitoring, and record keeping.
acute health effect
Definition:
Health effects that usually occur rapidly as a result of short-term exposures, and are of short duration. Some examples are irritation, corrosivity (tissue destruction), narcosis, and death
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