Carbon monoxide is a poisonous gas given off by burning fuel. Fit a carbon monoxide alarm.
It has no smell and no colour, which is exactly why it kills people in their sleep. Carbon monoxide binds to blood far more strongly than oxygen does and will not let go.
1nouncarbon monoxideA poisonous gas given off by burning fuel.
“The carbon monoxide alarm went off at two in the morning.”
carbon monoxide is a gas.