PAH stands for Polycyclic Aromatic Hydrocarbons. PAH research focuses on studying a group of organic compounds that are composed of multiple aromatic rings. These compounds are produced during incomplete combustion of organic materials, such as fossil fuels, wood, and tobacco. PAH compounds are known to be environmental pollutants and are associated with a range of negative health effects, including cancer and respiratory issues. Research in this area often involves studying the sources, distribution, and toxicity of PAH compounds, as well as developing methods for their detection and mitigation in the environment.