Photochemical Smog is caused by which pollutants in the presence of sunlight?

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Prepare for the California BAR Smog Technician Test. Review key topics with flashcards and multiple choice questions, each question includes hints and explanations. Get ready to ace your exam!

Multiple Choice

Photochemical Smog is caused by which pollutants in the presence of sunlight?

Explanation:
Photochemical smog forms when sunlight drives chemical reactions between hydrocarbons (HC) and nitrogen oxides (NOx) released from vehicles and other combustion sources. The sun’s energy starts radical reactions that convert NOx and HC into ozone (O3) and other oxidants in the air. That’s why pairing HC and NOx in the presence of sunlight best explains photochemical smog. Carbon monoxide alone doesn’t create this smog, particulate matter isn’t the primary driver here, and ozone is a product of these reactions, not the initial trigger.

Photochemical smog forms when sunlight drives chemical reactions between hydrocarbons (HC) and nitrogen oxides (NOx) released from vehicles and other combustion sources. The sun’s energy starts radical reactions that convert NOx and HC into ozone (O3) and other oxidants in the air. That’s why pairing HC and NOx in the presence of sunlight best explains photochemical smog. Carbon monoxide alone doesn’t create this smog, particulate matter isn’t the primary driver here, and ozone is a product of these reactions, not the initial trigger.

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