Atmospheric Pollution

Answer (d) aerosol of solids.

Particulate matter emitted from vehicles mainly includes lead (Pb), which comes from leaded gasoline. Although other metals like carbon monoxide (CO) are emitted as well, lead is most commonly associated with vehicle emissions. Thus, the correct answer is Option (B).

Acid rain is primarily caused by the reaction of sulfur dioxide (SO₂) and nitrogen oxides (NOₓ) with water vapor in the atmosphere. These gases react to form sulfuric acid (H₂SO₄) and nitric acid (HNO₃), which then fall to the earth as acid rain. Therefore, the correct answer is (D) Sulphur dioxide and nitrogen oxide.