What is the primary cause of photochemical smog in urban areas?

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Study for the Dual Enrollment Environmental Science Test. Prepare with flashcards and multiple choice questions, complete with hints and detailed explanations. Get ready for your exam!

Multiple Choice

What is the primary cause of photochemical smog in urban areas?

Explanation:
Photochemical smog forms when sunlight drives chemical reactions between pollutants that come from sources like vehicles, especially nitrogen oxides and volatile organic compounds. In urban areas, a large number of cars and trucks release these precursors into the air. Sunlight then powers reactions that convert NOx and VOCs into ozone and other oxidants near the ground, creating the characteristic hazy, reddish-brown smog. Natural sources or sea spray don’t provide the dense mix of reactive VOCs and NOx that cars do, and while industry can contribute, the high volume of vehicle emissions is typically the main driver of photochemical smog in cities.

Photochemical smog forms when sunlight drives chemical reactions between pollutants that come from sources like vehicles, especially nitrogen oxides and volatile organic compounds. In urban areas, a large number of cars and trucks release these precursors into the air. Sunlight then powers reactions that convert NOx and VOCs into ozone and other oxidants near the ground, creating the characteristic hazy, reddish-brown smog.

Natural sources or sea spray don’t provide the dense mix of reactive VOCs and NOx that cars do, and while industry can contribute, the high volume of vehicle emissions is typically the main driver of photochemical smog in cities.

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