“Gwreiddyn y broblem yw allyriadau cerbydau, ond Llywodraeth y DU sy’n gyfrifol am safonau cerbydau a mesurau cyllidol fel y Doll ar Gerbydau a’r Dreth ar Geir Cwmni.  Er inni erfyn dro ar ôl tro, mae Llywodraeth y DU wedi gwrthod datganoli’r pwerau a fyddai’n caniatáu inni wella’r safonau a defnyddio trethi i wella allyriadau.”
“The root cause is the emissions from vehicles, but legislative competence for vehicle standards and fiscal measures, such as the Vehicle Excise Duty and Company Car Tax, remain with the UK Government. Despite repeated calls, the UK Government has consistently refused to devolve powers which allow us to improve standards and incentivise improved emissions through the tax regime.”