Asbestos is a naturally occurring mineral that was widely used in building materials before its health hazards were discovered. It is composed of thin, fibrous crystals that, when disturbed, release microscopic fibers into the air. These fibers are easily inhaled and can lodge in the lungs, leading to various respiratory diseases, including mesothelioma and lung cancer.

Asbestos was commonly used in building materials before the 1980s, particularly in insulation, roofing, and flooring products. Due to its widespread use, many older buildings in King's Tamerton and Devon may contain asbestos.