If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.

Question: If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.
[A].

50

[B].

500

[C].

1000

[D].

3000 (i.e. 0.3%)

Answer: Option D

Explanation:

No answer description available for this question.