Explanation

Automobiles burn petroleum inefficiently causing 80% of air pollution and 75% of noise pollution. Automobile exhausts consists of hydrocarbon (13.7%), carbon monoxide (77.2%), nitrogen oxides (7.7%), sulphur oxides, ammonia, aldehydes and lead (90% of total lead poisoning). Lead is present in the form of Pb $\left( CH_{3} \right)_{4}$and $\left( C_{2}H_{5} \right)_{4}$as anti-knock agent in automobiles exhaust. It interferes with oxygen and glucose metabolism, haeme synthesis and damages the vital organs of body.