C13H10 is the chemical formula for a compound known as phenanthrene, which is a polycyclic aromatic hydrocarbon. It consists of three fused benzene rings, giving it a structure that is flat and planar. Phenanthrene is commonly found in coal tar and is used in various applications, including the production of dyes and as a chemical intermediate in organic synthesis. This compound is also of interest in environmental science due to its presence in petroleum and smoke from burning organic materials. Phenanthrene can be a pollutant, and its effects on health and the environment are studied to understand its potential risks.