priority pollutants, polycyclic aromatic hydrocarbons, pahs

anthracene aromatic benzene benzo benzoapyrene benzopyrene carbon carcinogen carcinogenic chemical chemistry coal component compound english epa formula grilled hydrocarbon illustration meat model molecular molecule naphthalene nomenclature organic pah pollutant pollutants polyaromatic polycyclic polynuclear priority pyrene ring science skeletal smoke structure substance symbol tar tobacco vector