Photochemical smog occurs in warm, dry and sunny climate. One of the following is not amongst the components of photochemical smog, identify it.
(i) NO2       (ii) O3       (iii) SO2       (iv) Unsaturated hydrocarbon

Answer: Option (iii)
Photochemical smog is a type of air pollution that is formed when primary pollutants, such as nitrogen oxides (NOx) and volatile organic compounds (VOCs), react with sunlight to form a complex mixture of secondary pollutants. These secondary pollutants include ozone (O3), peroxyacyl nitrates (PANs), and aldehydes, which can cause a range of health problems, including respiratory irritation, asthma, and lung damage.
Photochemical smog occurs in warm, dry, and sunny climates, which are ideal conditions for the chemical reactions that produce these secondary pollutants. The main sources of NOx and VOCs are automobiles and factories, which release these pollutants into the air through exhaust fumes and industrial processes.
Sulfur dioxide (SO2), on the other hand, is not typically a component of photochemical smog, although it is a common air pollutant that can contribute to other types of smog, such as sulfurous smog. SO2 is primarily produced by the burning of fossil fuels, such as coal and oil, and can cause respiratory problems and acid rain when it reacts with other chemicals in the atmosphere.

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