Polycyclic Aromatic Hydrocarbons (PAHs) are a class of organic compounds composed of multiple aromatic rings. They are primarily formed during the incomplete combustion of carbon-containing materials such as fossil fuels, wood, and tobacco. PAHs are ubiquitous in the environment, present in air, water, soil, and even in food. Their chemical structure makes them highly stable and persistent, leading to widespread distribution and accumulation in the ecosystem.