Definitions for "IDLH"
Immediately Dangerous to Life or Health. An environmental condition which would immediately place a worker in jeopardy. Usually used to describe a condition existing where self-contained breathing apparatus must be used.
A concentration of airborne contaminants, normally expressed in parts per million (ppm) or milligrams per cubic meter, which represents the maximum level from which one could escape within 30 minutes without any escape-impairing symptoms or irreversible health effects. This level is established by the National Institute of Occupational Safety and Health (NIOSH).
Immediate Dangers to Life and Health
Keywords:  infectious, substance
Infectious substance
Keywords:  contractor, independent
Independent contractor