What is the primary source of carbon monoxide pollution in the atmosphere, given that its safe threshold limit value (TLV) is below 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

The main contributor to atmospheric carbon monoxide is vehicle exhaust, which releases significant amounts of CO due to incomplete combustion of fuel. Other sources like industrial emissions, photochemical reactions, and domestic fuel burning contribute less comparatively.

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