What is the definition of the immediately dangerous to life and health level (IDLH)?
a. The atmospheric concentration of any substance that poses an immediate threat to life, causes irreversible or delayed adverse health effects, or interferes with an individual's ability to escape during a 30-minute period from a dangerous atmosphere
b. The amount of a substance, measured in milligrams per body mass, that kills half of a group of laboratory animals to which the substance is administered during a preestablished time
c. The concentration of a substance, in milligrams per kilogram (mg/kg), that kills a laboratory animal within 48 hours
d. The concentration of a substance to which workers can be exposed continuously for a period of approximately 15 minutes without suffering irritation, chronic or irreversible tissue damage, or narcosis sufficient to increase the risk of accidental injury, impair self-rescue, or materially reduce work-related efficiency
A
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