A recent study has revealed that more than one-third of all couches in the U.S. are thought to contain potential toxins.

The Duke University and the University of California study found that 85 per cent of the couches tested are treated with chemical flame retardents, which can be toxic or lack adequate health information.

Researchers found that 41 per cent of the 104 test couches contained high levels of chemicals.

Another 17 per cent contained toxin Penta-B.D.E (pentabromodiphenyl), which has been banned in most countries around the world.