emission unit
noun[C,usually plural]
ENVIRONMENTukus(alsoemissions unit)arightof acompanyto put anamountofharmfulgasesinto theairequalto 1000kilogramsofcarbondioxide(= agasformedwhencarbonisburned):
InEuropenearlyall of thevaluableemissionunitswere given away topowercompanies.