Asbestos is a naturally occurring mineral that was widely used in construction materials until the mid-20th century. Despite its many useful properties, such as heat resistance, insulation, and durability, asbestos is now known to be extremely harmful to human health. When asbestos-containing materials are disturbed or damaged, tiny asbestos fibers can become airborne and easily inhaled, leading to serious illnesses such as lung cancer, mesothelioma, and asbestosis. That's why it's crucial to have your building tested for asbestos if you suspect it may contain this dangerous substance.