What does action level mean?

action level meaning in Law Dictionary

the total amount of experience of a poison. The workplace must take precautions. The particular level needs to be one half permissable visibility limitations.

action level meaning in Business Dictionary

Level of exposure to a harmful substance or other hazard (present in a work environment or situation) at which an employer must take the required precautions to protect the workers. It is normally one half of the permissible exposure limit.