Photochemical smog is formed when primary pollutants interact with sunlight.
• A mixture of pollutants, which are produced when volatile organic compounds or VOCs and nitrogen oxides react to sunlight to produce a brown haze above the cities is known as photochemical smog.
• The two prime primary pollutants are VOCs and nitrogen oxides.
• The formation of photochemical smog takes place more generally in summer, as it is the time when maximum of sunlight is available.
• The nitrogen oxides are released from coal power plants, exhaust, and emissions from factories, while VOCs are released from paints, gasoline, and many cleaning solvents. When sunlight interact with these chemicals, they produce airborne particles and ground level ozone or smog.
Thus, correct answer is option a, that is, sunlight.
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