The term asbestos refers to several types of naturally occurring fibrous minerals. These fibers are resistant to heat, fire and chemicals and do not conduct electricity. It can be found in a variety of environments, from natural sources like serpentine rock to man-made sources like insulating materials such as thermal systems insulation and brake linings. Asbestos from either source can be a serious health concern if inhaled or ingested. Learn more about Naturally Occurring Asbestos (NOA) and the National Emission Standards for Hazardous Air Pollutants (NESHAP), as well as their impacts to your health, by clicking one of the buttons below.