What are PAHs (Polycyclic Aromatic Hydrocarbons)
Polycyclic aromatic hydrocarbons (PAHs) refer to a large class of organic compounds that consist of two or more fused aromatic rings. PAHs are emitted into the environment from both natural and anthropogenic sources. Major sources of PAHs to the aquatic and soil environments include creosote-treated products, spills of petroleum products, metallurgical and coking plants, and deposition of atmospheric PAHs.
In air, soil, and water, PAHs are mostly adsorbed to particulate matter, on which they are transported and degrade slowly. Since degradation is very slow in sediments, soils and sludge are the major environmental sinks for PAHs.