Practice question

Under GB 6944-2012, what is the statutory lethal concentration threshold (LC50) for a gas to be classified under Division 2.3 Toxic Gases (毒性气体)?

  1. Inhalation LC50 (lethal concentration for 50% test population over 4 hours) of not more than 5,000 mL/m³ (ppm)
  2. Inhalation LC50 of not more than 20,000 mL/m³ (ppm)
  3. Inhalation LC50 of not more than 50,000 mL/m³ (ppm)
  4. Inhalation LC50 of not more than 100 mL/m³ (ppm)

Answer: A — Inhalation LC50 (lethal concentration for 50% test population over 4 hours) of not more than 5,000 mL/m³ (ppm)

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