Which element in auto fumes may be chiefly responsible for impairment of children's intellectual functioning?

Name: Which element in auto fumes may be chiefly responsible for impairment of children's intellectual functioning?
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Question

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Lead is a toxic heavy metal present in auto fumes and exposure to it has been linked with impaired intellectual functioning in children. Nitric acid, carbon dioxide, and sulfur dioxide, on the other hand, do not directly affect cognitive function.

Which Element in Auto Fumes May Be Chiefly Responsible for Impairment