There is no minimum safe exposure level for any form of asbestos fibres, according to the World Health Organization.
More Australians have died from asbestos poisoning than died during the First World War so the Australian Government has just announced the creation of the Office of Asbestos Safety following the receipt of the Asbestos Management Review (pdf). Its aim to to complete the removal of all asbestos from Australian buildings by 2030. Asbestos is a global issue, and while Australia is keen to eliminate its use Canada is still mining and exporting the toxic substance which keeps turning up everywhere. [more inside]