Multiple choice

Of the following metals, which one pollutes the air of a busy city?

  1. Cadmium

  2. Chromium

  3. Lead

  4. copper
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lead and other heavy toxic metals or aerosols (solid or liquid gases which can spread through the air and are transported by) out of a fireplace like black or brown uncultivable smoke and fly ash in the air (contaminated soil and waste) pollute the air of a busy city.

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