Immediately dangerous to life and health

Immediately Dangerous to Life and Health (IDLH). Not estabUshed foi acryhc acid value shown is the emergency response-planning guide-3 (ERPG-3) for exposure up to one hour without life-threatening effects. 

IDLH means immediately dangerous to life and health. This is a concentration at which immediate action is required. The exac4 effect on an individual depends on the individuals physical condition and susceptibility to the toxic agent involved. It is the maximum airborne contamination concentration from which one could escape within 30 min without any escape-impairing symptoms or irreversible health effects (developed by NIOSH). 

Class A—immediately dangerous to life and health based on oxygen level less than 19.5 percent and/or airborne presence of toxic or poisonous substances in concentration constituting IDLH conditions flammabihty up to 20 percent of lower flammable limit. 

Immediately dangerous to life and health (IDLH) A condition that poses a threat of exposure to airborne contamination likely to cause death or immediate or delayed permanent adverse health effects, or that prevents escape. 

Toxic hazard IDLH (immediately dangerous to life and health) concentration Flammable vapor cloud Lower flammable limit... 

IDLH 25 This concentration poses an immediate danger to life and health (i.e., causes of irreversible toxic effects for a 30-minute exposure). 12... 

IDLH (immediately dangerous to life and health) is an index of exposure used in the United States. If such a concentration is reached, there is a need for emergency evacuation of buildings or use of an insulating mask. 

Immediately Dangerous to Life and Health International Agency for Research on Cancer International Labor Organization inch... 

IDLH Immediately dangerous to life and health, for 1-h exposures. Where no IDLH data are available, the 50% lethal concentration is shown, as LC50 ppm/time. 

Real-time, low-level monitors (with alarm) are required for Lewisite operations. In their absence, an Immediately Dangerous to Life and Health (IDLH) atmosphere must be presumed. Laboratory operations conducted in appropriately maintained and alarmed engineering controls require only periodic low-level monitoring. 

As a first step in assisting the LEPCs, EPA identified approximately 400 EHSs largely on the basis of their immediately dangerous to life and health (IDLH) values developed by the National Institute for Occupational Safety... 

The NIOSH immediately dangerous to life and health (IDLH) value (NIOSH 1994) is greater than the 30-min AEGL-3. NIOSH based their recommended exposure limit (REL) on the statement by Flury and Zernik (1931) that 45-54 ppm could be tolerated by man for 0.5 to 1 h without immediate or late effects. Although the Flury and Zernik (1931) data are based on animal studies, NIOSH did not apply a UF. 

In some circumstances such as may be encountered after a terrorist attack, acute doses may be more important than potential chronic effects. More specifically, high doses of radiation may be immediately dangerous to life and health and could lead to severe injury including sickness, irreparable tissue damage, and death, although the more severe effects would likely only be observed after a nuclear explosion. For the purpose of this discussion, acute exposures are defined as those that occur in a relatively short time (over several days or less) and result in a dose of at least 25-35 rad (0.25-0.35 Gy).6-7... 

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