Which of the following is NOT involved/required for photochemical smog formation in the ambient atmosphere?

Correct option is C

The correct answer is (c) Sulfur dioxide. Photochemical smog primarily forms due to the interaction of sunlight with pollutants such as volatile organic compounds (VOCs) and nitrogen oxides (NO and NO₂), which leads to the production of secondary pollutants like ozone (O₃).
Sulfur dioxide (SO₂) is not directly involved in the formation of photochemical smog. Instead, it contributes to industrial smog and acid rain.
Explanation of Other Options:
· (a) Volatile Organic Compounds (VOCs): Essential precursors in photochemical smog formation; they react with nitrogen oxides under sunlight.
· (b) Nitric Oxide (NO) and Nitrogen Dioxide (NO₂): Play a crucial role in the formation of ozone and other secondary pollutants.
· (d) Ozone (O₃): A key component of photochemical smog, formed through reactions involving VOCs and nitrogen oxides in the presence of sunlight.
Information Booster: 1. Photochemical Smog: A type of air pollution produced when sunlight reacts with pollutants like VOCs and nitrogen oxides (NOx).
2. Key Ingredients: VOCs, NO, NO₂, and sunlight.
3. Ozone Formation: Nitrogen dioxide (NO₂) photolyzes to produce nitric oxide (NO) and atomic oxygen, which then forms ozone (O₃).
4. Health Effects: Causes respiratory issues, eye irritation, and reduces visibility.
5. Sulfur Dioxide (SO₂): Involved in industrial smog and contributes to the formation of sulfuric acid (H₂SO₄), but not photochemical smog.
Additional Knowledge: · VOCs: Emitted by vehicles, industries, and vegetation.
· NOx: Produced primarily by combustion engines and power plants.
· Ozone (O₃): A harmful pollutant at ground level but beneficial in the stratosphere.
· SO₂: Contributes to acid rain and particulate matter but not photochemical smog.