The higher target for the chronic pulmonary obstructive disease (COPD) risk group is due to these individuals being particularly at risk if they contract a respiratory disease.
Y rheswm dros y targed uwch ar gyfer y grŵp risg clefyd rhwystrol cronig yr ysgyfaint (COPD) yw bod yr unigolion hyn mewn perygl arbennig os ydynt yn cael clefyd anadlol.