Generally speaking, the atmosphere in big cities is polluted mostly by :

Options

A. Radioactive fall out
B. Household waste
C. Automobile exhaust
D. Pesticide residues

Answer

C

Explanation

Automobile exhausts are major cause of atmospheric pollution. Proper maintenance of automobile along with the use of lead free petrol or diesel can reduce the pollutant they emit. Catalytic converters are used that are used to burn hydrocarbons completely to produce carbon dioxide and water