Used primarily in research as a polycyclic aromatic hydrocarbon (PAH) standard for environmental testing, Benzo[j]fluoranthene helps in the analysis of air, soil, and water pollutants. It serves as a marker compound in studies assessing combustion byproducts, especially from vehicle emissions and industrial processes. Due to its carcinogenic properties, it is also studied in toxicology to understand DNA damage and cancer mechanisms. Not used in commercial products because of its toxicity and environmental persistence.