Rheoliadau Sylweddau sy’n Teneuo’r Osôn a Nwyon Tŷ Gwydr wedi’u Fflworeiddio (Diwygio etc) (Ymadael â’r UE) 2020
The Ozone-Depleting Substances and Fluorinated Greenhouse Gases (Amendment etc) (EU Exit) Regulations 2020