Which group of chemicals is produced during incomplete combustion and is known to be carcinogenic?

Which group of chemicals is produced during incomplete combustion and is known to be carcinogenic?

• A. PAHs
• B. Nitrogen oxides
• C. Ozone
• D. Lead

Answer: (A)

Incomplete combustion yields polycyclic aromatic hydrocarbons, PAHs, formed when fuel burns with insufficient oxygen. These compounds consist of fused aromatic rings, and many PAHs are carcinogenic because they are metabolically activated to reactive species that bind to DNA and cause mutations. Benzo[a]pyrene is a well-known example. While nitrogen oxides, ozone, and lead can be associated with combustion processes, they are not the group of chemicals most classically linked to carcinogenic risk from incomplete combustion.

Incomplete combustion yields polycyclic aromatic hydrocarbons, PAHs, formed when fuel burns with insufficient oxygen. These compounds consist of fused aromatic rings, and many PAHs are carcinogenic because they are metabolically activated to reactive species that bind to DNA and cause mutations. Benzo[a]pyrene is a well-known example. While nitrogen oxides, ozone, and lead can be associated with combustion processes, they are not the group of chemicals most classically linked to carcinogenic risk from incomplete combustion.