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Which one of the following is NOT a component of photochemical smog ?

June 1, 2025 by rawan239

Which one of the following is NOT a component of photochemical smog ?

Ozone

Peroxyacetyl nitrate

Polyaromatic hydrocarbons

Nitric oxide

This question was previously asked in

UPSC CAPF – 2020

Download PDF Attempt Online

Polyaromatic hydrocarbons are NOT a direct component of photochemical smog formed by the reactions of NOx and VOCs.

Photochemical smog is primarily formed by the reaction of nitrogen oxides (NOx, primarily NO and NO2) and volatile organic compounds (VOCs) in the presence of sunlight. Key components produced by these reactions include ozone (O3), peroxyacetyl nitrates (PANs), aldehydes, ketones, and nitric acid. Nitric oxide (NO) is a precursor pollutant, quickly converted to NO2 which drives the photochemical process, so it is also present in the mixture. Polyaromatic hydrocarbons (PAHs) are complex organic compounds produced mainly from the incomplete combustion of organic matter (like in vehicle exhaust or burning wood). While PAHs are often present in polluted urban air (which experiences smog) and contribute to particulate matter, they are not formed *by* the photochemical reactions themselves.

Ozone (A) and Peroxyacetyl nitrate (B) are definitive, characteristic products and components of photochemical smog. Nitric oxide (D) is a primary pollutant and a crucial precursor (part of NOx) in the formation of photochemical smog.

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