Almost 70 schools in Canberra are closed today due to asbestos exposure concerns from potentially contaminated coloured sand products.

It comes as the list of recalled products expands, with the consumer watch-dog, the ACCC Listing products sold at major retailers including Target, Kmart, and Officeworks.

So how did these products end up in Australian schools, and what health risks do they pose?

• Guest: Associate Professor Anthony Linton, Academic and Research Director at the Asbestos and Dust Diseases Research Institute
• Producer: Lexie Jeuniewic