Asbestos is a mineral that was widely used in building materials in the UK until it was banned in 1999. If you live or work in a building that was constructed before this date, then it's possible that your building materials contain asbestos. Asbestos is dangerous when it's disturbed or damaged, as it can release tiny fibers that can be inhaled. Exposure to asbestos fibers can lead to serious health problems, including lung cancer, mesothelioma, and asbestosis.