Question

Smog that occurs mainly due to automobile exhausts and still air is

• A. Photochemical smog
• B. Classical smog
• C. London smog
• D. Both B and C

Answer 1

The correct option is A Photochemical smog

The photochemical reaction is caused by absorption of energy in the form of light. The word smog is formed of smoke and smog. Photochemical smog is the major contributor to the air pollution and is composed of primary and secondary pollutants. Primary pollutants being the nitrogen oxides and volatile organic compounds like Unsaturated hydrocarbons that have double or triple covalent bonds between adjacent carbon atoms. e.g., Ethylene. Gasoline and natural gas are major source of unsaturated hydrocarbon. Butadiene, benzene are some hydrocarbons that are lethal to human health and have potential to cause cancer.

Hence, the correct answer is 'Photochemical smog'