The Personal Air Breathing Unit includes a breathing air filter to remove oil vapors, hydrocarbons, toxins, and odors commonly found in compressed air system. The built-in carbon monoxide monitor continuously monitors the filtered air for compliance with current OSHA standards. The monitor is equipped with both audible and visual alarms, and operates on a 9-volt alkaline battery. An integral pressure regulator with gauge is provided to set the pressure for a NIOSH approved mask or hood. Also, a 54" tool hose is provided, prior to the unit, to complete the assembly for a single line hose system.