Rheoliadau Sylweddau sy’n Teneuo’r Osôn a Nwyon Tŷ Gwydr wedi’u Fflworeiddio a (Diwygiadau etc.) (Ymadael â’r UE) 2018
The Ozone-Depleting Substances and Fluorinated Greenhouse Gases (Amendments etc) (EU Exit) Regulations 2018