For comfortable working, the ___________ content should be limited to about0.6% by volume.(a) Oxygen(b) Hydrogen(c) Carbon monoxide(d) Carbon dioxideThe question was posed to me in an internship interview.This key question is from Types of Ventilation in division Acoustics and Ventilation of Construction & Building Materials

For comfortable working, the ___________ content should be limited to

1.	For comfortable working, the ___________ content should be limited to about0.6% by volume.(a) Oxygen(b) Hydrogen(c) Carbon monoxide(d) Carbon dioxideThe question was posed to me in an internship interview.This key question is from Types of Ventilation in division Acoustics and Ventilation of Construction & Building Materials
Answer» RIGHT OPTION is (d) CARBON dioxide For explanation I WOULD say: It is observed that breathing is difficult when the AMOUNT of carbon dioxide by volume is about 6% and a man loses consciousness when it reaches about 10% or so. The more the amount of carbon dioxide, the more difficult is the breathing.

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