Asbestos is a naturally occurring mineral that was popularly used in the construction of buildings, bridges, and other structures in the UK until the late 1990s. Although asbestos is an excellent insulator, it is harmful to human health. When the asbestos-containing materials are disturbed or damaged, tiny fibers of asbestos are released into the air, which can cause significant health problems such as lung cancer, mesothelioma, and asbestosis.