Information on the quality of consumption emission statistics can be found in Annex A of the Statement of Progress on Carbon Budget 1 in the methodology section (page 96)
Mae gwybodaeth am ansawdd ystadegau allyriadau defnydd ar gael yn Atodiad A y Datganiad o Gynnydd ar Gyllideb Carbon 1 yn yr adran methodoleg (tudalen 96).