Which substance leads to fatal asphyxiation when its concentration in the air surpasses the safe limit of 50 ppm?

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 chemicals, carbon monoxide is the one that causes death by asphyxiation if its atmospheric concentration exceeds 50 ppm. Benzopyrene, peroxyacetyl nitrate, and sulfur dioxide have different toxic effects but do not primarily cause asphyxiation.

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