For couple households where one adult was able to speak Welsh, the Welsh language transmission rate was highest in Gwynedd (at 60.0%), and lowest in Blaenau Gwent (at 18.8%)
Yn achos cartrefi cwpwl lle roedd un oedolyn yn gallu siarad Cymraeg, Gwynedd oedd â’r gyfradd trosglwyddo’r Gymraeg uchaf (60.0%), a Blaenau Gwent oedd â’r isaf (18.8%)