Volatile organic compounds are emitted primarily from which source?

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BlackTom AI · Accepted Answer

The question asks which source primarily emits volatile organic compounds (VOCs).
Option 1: 'power plants' — While power plants do release VOCs, their contributions are generally smaller compared to transportation sources in many urban and regional air quality contexts, so this is not the primary source.
Option 2: 'Motor Vehicles' — This is the key source contributing a large share of ambient VOCs, due to vehicle exhaust, fuel evaporation, and solvent use associated with driving, making it the correct emphasis for VOC emissions in many settings.
Option 3: 'Industrial and commercial processes' — These processes do emit VOCs (solvents, coatings, chemical production), but collectively they typically do not surpass the combined VOC output from motor vehicles, especially in areas with heavy traffic. The phrase 'primarily from which source' points to the dominant contributor, which is motor vehicles in most analyses.

EGEE 102 (SP25): Energy Conservation for Environmental Protection FINAL EXAM

Volatile organic compounds are emitted primarily from which source?

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