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Nisha Gupta • 2.32K Points
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Q. Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds _________ percent (by volume).

  • (A) 1
  • (B) 3
  • (C) 7
  • (D) 20
  • Correct Answer - Option(D)
  • Views: 468
  • Filed under category Environmental Engineering
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