Carbon monoxide (CO) is a colourless, odourless, tasteless, poisonous gas produced by incomplete burning of carbon-based fuels, including gas, oil, wood and coal.
Nwy di-liw, di-arogl, di-flas, gwenwynig yw Carbon monocsid (CO), a gynhyrchir wrth losgi tanwydd carbon, megis nwy, olew, pren a glo, yn anghyflawn.