| Subject | English | Basque |
| environ. | aromatic compound Compounds characterized by the presence of at least one benzene ring | konposatu aromatiko |
| environ. | aromatic hydrocarbon Hydrocarbons having an unsaturated ring containing alternating double and single bonds, especially containing a benzene ring | hidrokarburo aromatiko |
| environ. | aromatic substance Substance having a distinctive, usually fragrant smell | substantzia usaintsu |
| environ. | polycyclic aromatic hydrocarbon Hydrocarbons containing two or more closed rings of atoms | HAP |
| environ. | polycyclic aromatic hydrocarbon Hydrocarbons containing two or more closed rings of atoms | hidrokarburo aromatiko polizikliko |