Vehicle Emissions

**Definition:** Gases, fumes, vapors, and ODORANTS escaping from the cylinders of a gasoline or diesel internal-combustion engine. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed & Random House Unabridged Dictionary, 2d ed)

**Tree numbers:** - D20.832

**Synonyms:** - Vehicle Emission - Vehicular Emission - Vehicular Emissions