Also known as Halon-1301, this chemical with formula CBrF₃ is one of the most ozone destructive substances known to man. It is listed as a Class I ozone depleting chemical in the United States Clean Air Act amendments of 1990. This chemical is commonly used in fire fighting equipment used around sensitive electronic equipment such as computer rooms, telecommunication centers, and aviation equipment. It is know to cause headache and unconsciousness in humans.