A group of highly reactive organic compounds, such as naphthalene and biphenyls, that are a common component of creosotes, which can be carcinogenic.
POLYNUCLEAR AROMATIC HYDROCARBONS (PNAS)
Meaning of POLYNUCLEAR AROMATIC HYDROCARBONS (PNAS) in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012