Asbestos is a hazardous material that was commonly used in building materials before the dangers were fully understood. It's made up of microscopic fibers that, when inhaled, can cause serious health issues, including lung cancer, mesothelioma, and asbestosis. It's estimated that around 5,000 people die each year in the UK due to asbestos-related conditions.

Asbestos can be found in a wide variety of building materials, including insulation, tiles, cement, ceiling tiles, and more. Asbestos was used extensively in construction prior to 2000, so many older buildings are likely to contain asbestos.