Air Breathing Apparatus is used to provide breathable air in a hostile environment. It has a base plate, compressed air bottle mounted to the base plate using a fastening strap. An additional fixing device and a high-pressure fitting attached to the compressed air bottle. It provides respiratory protection when work in atmospheres of oil drilling and the manufacturing and handling of chemicals. It serves as a long-duration work device and as an escape device. It is approved for respiratory protection for entry into, extended periods of work in, and for escape from atmospheres. The self-contained air supply is approved.