If it refers to biology, as on the stem of a plant that leaves the earth or the lungs of an animal that exchange gases in the air, it is perfectly understood with organ and air. If you refer to the musical instrument, see carillon .
AIR ORGAN Said of a plant or other vegetable : Organ that is exposed to air . In some plants the roots stand out from the soil and become aerial organs. Said of an animal: the lungs or other organ that conducts or processes air.