PAHs are formed as a product of which process?

PAHs are formed as a product of which process?

• A. Complete combustion
• B. Biological metabolism
• C. Photochemical reaction
• D. Incomplete combustion

Answer: (D)

PAHs form when organic material is burned with insufficient oxygen. In incomplete combustion, the fuel doesn’t fully oxidize, so large hydrocarbon fragments survive and link up to form stable multi-ring aromatic structures. These structures accumulate and can attach to soot particles, making PAHs common in smoke and charred materials. If combustion is complete, the main products are carbon dioxide and water, with far fewer PAHs produced. While PAHs can also undergo atmospheric reactions once released, their formation at the source is best explained by incomplete combustion.

PAHs form when organic material is burned with insufficient oxygen. In incomplete combustion, the fuel doesn’t fully oxidize, so large hydrocarbon fragments survive and link up to form stable multi-ring aromatic structures. These structures accumulate and can attach to soot particles, making PAHs common in smoke and charred materials. If combustion is complete, the main products are carbon dioxide and water, with far fewer PAHs produced. While PAHs can also undergo atmospheric reactions once released, their formation at the source is best explained by incomplete combustion.