[Vitani]

Carbon Monoxide (Co) is also a poisonous gas which when left leaking in a closed room, will slowly take over the oxygen, putting you in a deep sleep until finally death. We also breath out Co, when we breath air in, we're breathing in about 20% oxygen, when breathing out we're breathing out 17% oxygen, that's how people suffocate in sealed rooms, a lot of people think that when we breath out, it would take over as oxygen, when in fact that's not the case.