What poisonous gas is emitted from car exhaust that may be fatal to human beings?

Question

Quizplus · Accepted Answer

Carbon monoxide is a poisonous gas that is emitted from car exhaust and can be fatal to human beings. Oxygen is not poisonous and is actually necessary for human survival. Carbon dioxide is also emitted from car exhaust, but in lower concentrations and is not as immediately dangerous as carbon monoxide. Hydrogen is not typically emitted from car exhaust in significant amounts.

What Poisonous Gas Is Emitted from Car Exhaust That May