Practice question

When monitoring an atmosphere with multiple instruments, the recommended general order of concern that responders typically prioritize is:

  1. Oxygen, then flammability (LEL), then toxicity
  2. Toxicity, then oxygen, then flammability
  3. Flammability, then toxicity, then oxygen
  4. Radiation only

Answer: A — Oxygen, then flammability (LEL), then toxicity

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