Practice question

An air-purifying respirator (APR) is acceptable for use ONLY when which condition is met?

  1. The atmosphere contains less than 5% oxygen
  2. The contaminant, its concentration, and that the atmosphere is not IDLH are all known
  3. Any contaminant is present in any concentration
  4. The responder is performing offensive operations

Answer: B — The contaminant, its concentration, and that the atmosphere is not IDLH are all known

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