Polycyclic Aromatic Hydrocarbons
Polycyclic Aromatic Hydrocarbons (PAHs) are pollutants formed from both natural and anthropogenic sources, with the latter being the most significant contributor. Natural sources include forest fires, volcanic eruptions, and degradation of biological materials. Major anthropogenic sources include the burning of coal refuse banks, coke production, automobiles, commercial incinerators, and wood gasifers. Information Source: USGS.
PAHs are thought to be carcinogenic. Information Source: EPA.