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Of the following, which one pollutes the air of a big city ?
Of the following, which one pollutes the air of a big city ?
A). Copper
B). Chromium
C). Lead
D). Cadmium
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Lead
Lead pollution primarily came from cars in the past. Today, lead pollution primarily comes from lead smelters, metal processing plants and incinerators. Deposits of lead in soil can harm both humans and animals by absorbing it into a body.
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