AP®︎ Environmental Science: Topic 7.2 Flashcards

Master key terms and definitions for Topic 7.2 of AP Environmental Science – Photochemical Smog to help you prep for quizzes and the AP exam.

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Term

Photochemical Smog (Brown Smog; Los Angeles–Type Smog)

Definition

Brownish pollutant mixture formed when NOₓ and VOCs react in the sunlit lower atmosphere, producing ground-level ozone and other photochemical oxidants

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Photochemical Smog (Brown Smog; Los Angeles–Type Smog)
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Brownish pollutant mixture formed when NOₓ and VOCs react in the sunlit lower atmosphere, producing ground-level ozone and other photochemical oxidants

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Nitrogen Oxides (NOₓ)
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Nitrogen compounds, especially NO and NO₂, produced mainly by high-temperature combustion and acting as primary precursors of photochemical smog

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Volatile Organic Compounds (VOCs)
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Carbon-containing compounds that readily evaporate or sublime near room temperature; gasoline, formaldehyde, solvents, and tree emissions provide smog-forming VOCs

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Tropospheric Ozone (Ground-Level Ozone)
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Harmful secondary O₃ formed in the lower atmosphere by sunlight-driven reactions involving NOₓ and VOCs; a major component of photochemical smog

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