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Difficulty: HardAir Pollutants, Photochemical Smog, and Acid Rain

Photochemical smog is primarily formed during cold, humid winter mornings when atmospheric sulfur dioxide (SO2SO_2) and carbon soot interact with trapped fog droplets.

Answer: Answer

Answer

The statement is False. Photochemical smog requires solar radiation, nitrogen oxides, and hydrocarbons under warm, dry conditions, whereas cold, humid conditions involving sulfur dioxide and soot produce industrial (sulfurous) smog.
The statement is false because it describes classical industrial (sulfurous) smog rather than photochemical smog. Photochemical smog develops in sunny, warm environments through solar UV-driven reactions of nitrogen oxides (NOxNO_x) and unburnt hydrocarbons, yielding oxidants such as ground-level ozone (O3O_3) and peroxyacetyl nitrate (PAN).

Step-by-Step Solution

1
Examine the environmental conditions and chemical precursors cited in the statement.
The statement describes cold, humid winter mornings with sulfur dioxide (SO2SO_2) and carbonaceous soot.
Identifying the atmospheric parameters is essential to distinguish between atmospheric smog classifications.
2
Compare industrial (sulfurous) smog and photochemical smog mechanisms.
Industrial smog originates from sulfur dioxide (SO2SO_2) and particulates reacting in damp air, whereas photochemical smog requires sunlight-driven photochemical reactions involving nitrogen oxides (NOxNO_x) and volatile organic compounds (VOCs).
Solar ultraviolet light is mandatory for initiating the photolysis of NO2NO_2 into NONO and oxygen radicals, which leads to photochemical smog.
3
Evaluate the statement's validity.
The statement misidentifies industrial smog conditions as those of photochemical smog.
Since the stem describes conditions unique to industrial sulfurous smog, the claim regarding photochemical smog is incorrect.

Key Concept

Distinction between Photochemical Smog and Industrial (Sulfurous) Smog
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Topics

Air Pollutants, Photochemical Smog, and Acid Rain

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