which of the following metals is known to pollute the air of big cities with a large number of vehicles?

A Mercury
B Iron
C Lead
D Copper

Correct Answer: Lead

Lead pollutes the air of a big city. Lead (Pb) is a metal found naturally in the environment as well as in manufactured products. The major sources of lead emissions have historically been from fuels in on - road motor vehicles (such as cars and trucks) and industrial sources.
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