Not only is CO responsible for many deaths and poisonings each year, but many people are also likely to be affected by CO without realising it.
Nid yn unig y mae CO yn gyfrifol am lawer o farwolaethau ac achosion o wenwyno bob blwyddyn ond mae'n debygol y bydd CO yn effeithio ar lawer o bobl heb iddynt sylweddoli hynny.