The poisonous gases found in the exhaust fumes of car engines are the products of combustion which are carbon dioxide and carbon monoxide. They are known to be toxic and carcinogenic. Hope this answers the question. Have a nice day.
Carbon Monoxide is the poisonous gas that is found in the exhaust fumes of car engines. A person should never sit in a closed garage, building, etc without adequate ventilation. The carbon monoxide can kill a person very fast in these types of situations.