Polycyclic Aromatic Compounds (PACs) are organic molecules made up of multiple fused aromatic rings. These compounds are typically formed during the incomplete combustion of organic materials, such as fossil fuels, wood, and tobacco. PACs are found in various environments, including air, soil, and water, and can be released from sources like vehicle exhaust and industrial processes. Due to their stable structure, PACs can persist in the environment and may accumulate in living organisms. Some PACs are known to be harmful, as they can pose health risks, including cancer, when humans are exposed to them over time. Monitoring and regulating PAC levels is important for public health and environmental safety.