Used primarily in environmental and analytical chemistry as a reference standard for the detection and quantification of polycyclic aromatic hydrocarbons (PAHs) in various samples. It helps in monitoring air, water, and soil pollution, especially in industrial areas. Additionally, it is employed in research studies to understand the behavior, distribution, and toxicity of PAHs in ecosystems. Its application is critical in assessing environmental health risks and ensuring compliance with regulatory standards for PAH emissions.