Which is a natural source of VOCs?

Which is a natural source of VOCs?

• A. Trees
• B. Industrial solvents
• C. Vehicles
• D. Petrochemicals

Answer: (A)

VOCs come from both natural and human-made sources. Among natural sources, trees emit a variety of volatile organic compounds such as isoprene and terpenes from their leaves. These emissions are part of normal plant metabolism and can increase with warm temperatures and sunlight. In the atmosphere, VOCs from trees can participate in ozone formation, especially under sunny, hot conditions. The other options reflect human-made sources: industrial solvents release VOCs through manufacturing and cleaning, vehicles emit VOCs from fuel evaporation and exhaust, and petrochemicals release VOCs during processing and spills. Since the question asks for a natural source, trees are the correct source.

VOCs come from both natural and human-made sources. Among natural sources, trees emit a variety of volatile organic compounds such as isoprene and terpenes from their leaves. These emissions are part of normal plant metabolism and can increase with warm temperatures and sunlight. In the atmosphere, VOCs from trees can participate in ozone formation, especially under sunny, hot conditions. The other options reflect human-made sources: industrial solvents release VOCs through manufacturing and cleaning, vehicles emit VOCs from fuel evaporation and exhaust, and petrochemicals release VOCs during processing and spills. Since the question asks for a natural source, trees are the correct source.