Which pollutant is formed by sunlight-driven chemical reactions and is linked to smog, with sources including burning fossil fuels?

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Multiple Choice

Which pollutant is formed by sunlight-driven chemical reactions and is linked to smog, with sources including burning fossil fuels?

Sunlight drives chemical reactions in the lower atmosphere that create a secondary pollutant known as ground-level ozone. It isn’t emitted directly; ozone forms when sunlight triggers reactions between nitrogen oxides and volatile organic compounds released by burning fossil fuels. The stronger the sun and heat, and the more precursors present, the more ozone builds up, contributing to the smog that clouds urban skies. Other pollutants are either directly released from burning fuels—like sulfur dioxide and carbon monoxide—or are mixtures of particles that arise from various sources. Ground-level ozone is the classic photochemical smog component, formed by sunlight-driven processes, which is why it’s the best answer.

Sunlight drives chemical reactions in the lower atmosphere that create a secondary pollutant known as ground-level ozone. It isn’t emitted directly; ozone forms when sunlight triggers reactions between nitrogen oxides and volatile organic compounds released by burning fossil fuels. The stronger the sun and heat, and the more precursors present, the more ozone builds up, contributing to the smog that clouds urban skies. Other pollutants are either directly released from burning fuels—like sulfur dioxide and carbon monoxide—or are mixtures of particles that arise from various sources. Ground-level ozone is the classic photochemical smog component, formed by sunlight-driven processes, which is why it’s the best answer.

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