Data shows Wales is ahead of the rest of the UK in the move to the use of inhalers which have a lower impact on climate change and global warming.
Mae data'n dangos bod Cymru ar y blaen i weddill y DU wrth iddi symud at ddefnyddio anadlwyr sy'n cael llai o effaith ar y newid yn yr hinsawdd a chynhesu byd-eang.