Basic Firefighter Written Exam 2025 – 400 Free Practice Questions to Pass the Exam

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What does IDLH stand for?

Instantly Dangerous to Life and Health

Immediately Dangerous to Life and Health

The term IDLH stands for "Immediately Dangerous to Life and Health." This designation is utilized in various safety and emergency response contexts, particularly in firefighting, hazardous materials handling, and industrial safety. An environment classified as IDLH poses an immediate threat to life or would cause irreversible health effects without proper protective equipment. This classification informs firefighters and emergency responders of serious hazards that require quick action and specialized gear to ensure safety while performing rescues or mitigating hazardous situations. Other options do not accurately capture the standard definitions used in safety regulations and protocols.

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Individually Dangerous to Life and Health

Intensely Dangerous to Life and Health

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