Level of Concern: The concentration in air of an extremely hazardous substance above which there may be serious immediate health effects to anyone exposed to it for short periods ...
The maximum level to which a healthy individual can be exposed to a chemical for 30 minutes and escape without suffering irreversible health effects or impairing symptoms. Used as a "level of concern." (See> level of concern.)
Imminent Hazard ...
Dangerous to Life and Health (IDLH): The maximum level to which a healthy individual can be exposed to a chemical for 30 minutes and escape without suffering irreversible health effects or impairing symptoms. Used as a "level of concern.
The maximum distance from the point of release of a hazardous substance in which the airborne concentration could reach the level of concern under specified weather conditions.
Source: Terms of the Environment
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Radius of Vulnerability Zone: The maximum distance from the point of release of a hazardous substance in which the airborne concentration could reach the level of concern under specified weather conditions.
Vulnerable Zone- An area over which the airborne concentration of a chemical accidentally released could reach the level of concern.
Hazardous substance means substances or group of substances that are toxic, persistent and liable to bio-accumulate, and other substances or groups of substances which give rise to an equivalent level of concern.
Definition source ...
 See also: Hazard, Air, Waste, Water, Concentration
  
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