Benzo[a]pyrene: A polycyclic aromatic hydrocarbon (PAH) having the molecular structure shown below, or a molecule containing this moiety. A known human carcinogen, found in asphalt, burning organic material, chimney soot, etc.

• Related terms: Benzene, benzene ring, arene, naphthalene, anthracene, phenanthrene, coronene, graphene
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