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Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds __________ percent (by volume).

/ CHEMICAL ENGINEERING, Environmental Engineering / By
Question: 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

Answer: Option D

Explanation:

No answer description available for this question.