The CDC developed IDLH to:

The CDC developed IDLH to:

• A. To ensure that the worker can escape from a given contaminated environment in the event of failure of respiratory protection equipment and to indicate a maximum level above which only a highly reliable breathing apparatus, providing maximum worker protection, is permitted.
• B. To set general environmental standards.
• C. To determine PPE cost limits.
• D. To define evacuation routes.

Answer: (A)

IDLH defines an atmosphere that would pose an immediate threat to life or health or would impair a worker’s ability to escape from the environment. This concept is used to guide respiratory protection decisions: if the atmosphere reaches IDLH levels, workers must be protected by highly reliable equipment and procedures that ensure a safe escape if protection fails. The statement reflects that purpose by linking the threshold to both the need for a robust respirator and the ability to escape. It’s not about setting general environmental standards, cost limits, or evacuation routes—these are governed by other standards and safety practices.

IDLH defines an atmosphere that would pose an immediate threat to life or health or would impair a worker’s ability to escape from the environment. This concept is used to guide respiratory protection decisions: if the atmosphere reaches IDLH levels, workers must be protected by highly reliable equipment and procedures that ensure a safe escape if protection fails. The statement reflects that purpose by linking the threshold to both the need for a robust respirator and the ability to escape. It’s not about setting general environmental standards, cost limits, or evacuation routes—these are governed by other standards and safety practices.