Which atmospheric contaminant can be identified by its distinctive smell when present in the air?

Chemical Environmental Engineering MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

PPSCFPSCNTSPakistan govt jobs
Subject
Chemical Environmental Engineeringchemical-engineering › chemical-environmental-engineering-chemical-engineering
Published
11 Mar 2019
Last updated
28 May 2026

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Explanation

Among the listed pollutants, sulfur dioxide (SO2) is known for its sharp, irritating odor, making it detectable by smell. In contrast, carbon monoxide (CO), nitrogen dioxide (NO2), and carbon dioxide (CO2) are generally odorless under normal conditions.

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