Photochemical smog consists of excessive amount of X in addition to aldehydes, ketones, PAN etc. X is (1) Methane (2) Carbon monoxide (3) CArbon dioxide (4) Ozone

Answer: (4)

Photochemical smog or summer smog is a type of smog that is produced when UV light originating from the sun interacts with the oxides of nitrogen present in the atmosphere. Photochemical smog is formed by a complex series of chemical reactions involving sunlight, oxides of nitrogen, and volatile organic compounds, aldehydes, ketones, PAN and ozone that are present in the atmosphere as a result of air pollution.

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