Which of the following is the most dangerous metal pollutant of automobile exhaust ?

Options

A. Cadmium
B. Copper
C. Mercury
D. Lead

Answer

D

Explanation

Automobiles burn petroleum inefficiently causing 80 % of air pollution and 75 % of noise pollution in urban areas. They release hydrocarbons (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 petroleum in the form of `Pb(CH_(3))_(4) " and " Pb(C_(2)H_(5))_(4)` as antiknock agent.