Asbestos-contaminated dust or debris (ACD) is dust or debris that has settled in a workplace that is or could reasonably be assumed to be contaminated with asbestos, which refers to silicate minerals with fibrous crystals whose fibre can be released into the atmosphere through abrasion. The substance is universally recognised to cause significant health hazard including risk of cancer, leading to multinational ban on its usage for building materials.

In Australia, ACD at a workplace must be cleaned up by a Class A asbestos removalist unless it’s associated with a class B removal job, initiated by a removal job of 10 m2 or less of non-friable asbestos, or it can be categorised as a ‘minor’ contamination.

Other than the exceptions mentioned above, a removal must be conducted by a licenced removalist. Only a business or a person operating as a business (an entity) is qualified to apply for a removal or assessor licence.

Whether the ACD is a minor contamination or not should be determined by a qualified or competent individual for accurate and thorough risk assessment. Factors to consider include but are not limited to the time required for clean-up, size and extent of the contamination, and the number of workers that would likely be exposed.