Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds ______________ percent (by volume)?
Correct answer: D. 20
- A. 1
- B. 3
- C. 7
- D. 20
Explanation
Carbon dioxide becomes acutely life-threatening at concentrations above roughly 20% by volume, causing severe oxygen displacement and unconsciousness or death. Concentrations around 3% to 7% cause distress and impaired breathing but are not the stated death threshold.
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