| Subject | English | Catalan |
| environ. | aromatic compound Compounds characterized by the presence of at least one benzene ring | compost aromàtic |
| environ. | aromatic hydrocarbon Hydrocarbons having an unsaturated ring containing alternating double and single bonds, especially containing a benzene ring | hidrocarburs aromàtics |
| environ. | aromatic substance Substance having a distinctive, usually fragrant smell | substància aromàtica |
| environ. | polycyclic aromatic hydrocarbon Hydrocarbons containing two or more closed rings of atoms | hidrocarbur aromaticopolicíclic |