Which of the following Volatile Organic Compounds (VOCs) are emitted from anthropogenic sources only?

Benzene and toluene are volatile organic compounds released only from human-made sources.

Statement 1, isoprene, is emitted mainly by plants, so it is biogenic.

Statement 2, benzene, comes from fuels, solvents and vehicle exhaust, all anthropogenic.

Statement 3, terpene, is released naturally by vegetation, and Statement 4, methane, has large natural sources too.

Statement 5, toluene, is a solvent and fuel component of human origin, so the anthropogenic-only pair is benzene and toluene.

Biogenic isoprene and terpenes are major natural contributors to ozone formation.