5-Methylchrysene, a carcinogenic polycyclic aromatic hydrocarbon with four fused rings, functions as an aryl hydrocarbon receptor agonist. It is generated through the incomplete combustion of organic matter and primarily detected in gasoline exhaust and tobacco smoke. Additionally, 5-Methylchrysene can be converted into mutagenic metabolites by cytochromeP450 enzymes 1A1 and 1B1.