AF uses gas cylinders for passenger oxigen. See also the accident report on AF's A340 F-GLZQ:
http://www.tsb.gc.ca/eng/rapports-re...2/a05h0002.pdf
"The forward cargo door was found in place and closed. Next to the cargo
door, coincident with the location of the passenger oxygen cylinders, was a large hole in the fuselage wall that bore signs of explosive force."