Phenanthrene is a polycyclic aromatic hydrocarbon (PAH) composed of three fused benzene rings. It is a solid, crystalline compound that is typically found in coal tar and is produced during the incomplete combustion of organic materials. Phenanthrene is often used in research and industrial applications, including the production of dyes and as a precursor for various chemical syntheses. This compound has a molecular formula of C14H10 and is known for its characteristic aromatic properties. Phenanthrene can be found in the environment, particularly in areas with high levels of pollution, and is studied for its potential health effects, as some PAHs are known to be carcinogenic.