Polycyclic Aromatic Hydrocarbons (PAHs) are organic compounds made up of multiple fused aromatic rings. They are primarily formed during the incomplete combustion of organic materials, such as fossil fuels, wood, and tobacco. PAHs can be found in various environments, including air, soil, and water, and are often associated with industrial processes and vehicle emissions. These compounds are of concern due to their potential health effects, as some PAHs are known to be carcinogenic, meaning they can contribute to the development of cancer. Regulatory agencies monitor PAH levels in the environment to assess risks to human health and ecosystems, emphasizing the importance of reducing exposure to these harmful substances.