Why Do Some People Like the Smell of Car Exhaust?

1 Answers
VonMarcus
07/29/25 9:32pm
Liking the smell of car exhaust is because there is a substance called acetaldehyde gas in the exhaust. Acetaldehyde is a fruity-smelling compound that many people find pleasant. Modern fuels contain additives, mostly aromatic hydrocarbons like benzene, which have a strong odor and are the primary source of the 'smell' in car exhaust. More related information is as follows: Exhaust emissions: The main aldehyde in car exhaust is formaldehyde, accounting for 60%~70%. Formaldehyde is an irritating gas that affects the eyes and respiratory tract, with an olfactory threshold of 0.06~1.2mg. High concentrations can cause coughing, chest pain, nausea, and vomiting. Acetaldehyde is a low-toxicity substance, but it has anesthetic effects at high concentrations. Acrolein: Acrolein is a pungent, irritating gas that strongly affects the eyes and respiratory tract, potentially causing bronchial cell damage, with an olfactory threshold of 0.48~4.1mg.
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