Environmental Engineering in CE

Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N₂ in contaminated air at which it acts as a natural asphyxant is ≥ ____ percent.

  • A. 84
  • B. 88
  • C. 80
  • D. 92
Answer: Option A.

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