Motor vehicle exhaust is a source of which odorless,colorless gas that also contributes to the formation of smog?

Question

Quizplus · Accepted Answer

Motor vehicle exhaust is a significant source of carbon monoxide (CO), an odorless and colorless gas that is harmful to human health and contributes to the formation of smog. Lead (B) has been phased out of gasoline in most countries, carbon dioxide (C) is a natural byproduct of combustion and does not directly contribute to smog formation, and sulfur dioxide (D) is also emitted from motor vehicle exhaust but is more commonly associated with industrial emissions from power plants and other sources.

Motor Vehicle Exhaust Is a Source of Which Odorless,colorless Gas