Asbestos is a mineral that was widely used in construction materials in the past due to its heat-resistant and fire-retardant properties. It was commonly used in ceilings, walls, floors, roofs, and other building components.

However, asbestos can pose a serious health risk when its fibres are released into the air and inhaled. These fibres can cause lung cancer, mesothelioma, and other respiratory diseases, particularly when exposure is frequent or prolonged.

Due to the health risks associated with asbestos, its use has been banned in many countries, including the UK, since the late 1990s. However, many buildings still contain asbestos-containing materials (ACMs) that were installed before the ban.