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Encyclopedic overview
Polycyclic aromatic hydrocarbons are organic compounds that contain at least three fused benzene rings. A typical polycyclic aromatic hydrocarbon is benzopyrene.
Hydrocarbons consist of only carbon and hydrogen. Polycyclic aromatic compounds that include other elements as substituents or in heterocyclic rings are not PAHs; they belong to the parent category, Category:Polycyclic aromatic compounds.
Excerpted from Wikipedia’s “Category:Polycyclic aromatic hydrocarbons” article, available under the CC BY-SA 4.0 licence.