Asbestos is a hazardous substance that is banned in many countries due to its harmful effects on human health. Exposure to asbestos can lead to serious respiratory diseases, including lung cancer and mesothelioma.

In the past, asbestos was commonly used in buildings, especially for insulation and fireproofing. However, due to its risks, it's now illegal to use or import asbestos in the United Kingdom. Nevertheless, old buildings may still contain asbestos, and the material needs to be managed carefully to avoid health risks.