Benzo[ghi]perylene is primarily used in environmental studies as a marker for polycyclic aromatic hydrocarbon (PAH) pollution. It is often monitored in air, water, and soil samples to assess the extent of contamination from combustion processes, such as vehicle emissions, industrial activities, and wildfires. Due to its persistence and stability, it serves as a reliable indicator of long-term exposure to PAHs. Additionally, it is utilized in research to understand the behavior and distribution of PAHs in various ecosystems. Its presence is also analyzed in food products to evaluate potential risks to human health from dietary exposure.