This was done to implement international obligations, which are placed on the UK by changes to the Stockholm Convention on POPs coming into force on 16 November.
Gwnaed hyn i weithredu rhwymedigaethau rhyngwladol, sy'n cael eu gosod ar y DU drwy newidiadau i Gonfensiwn Stockholm ar POPs a ddaeth i rym ar 16 Tachwedd.