seems to be used in some kinds of technical texts since the 1940s
permeable, already in Webster 1828
PER''MEABLE, a. [L.permeo; per and meo, to pass or glide.] That may be passed through without rupture or displacement of its parts, as solid matter; applied particularly to substances that admit the passage of fluids. Thus cloth, leather, wood are permeable to water and oil; glass is permeable to light, but not to water. Webster 1828
an early example of permeable relating to air:
"...what will be the utility of arrangements by which the mere joints may be made tight, when the material itself if porous, and (by air) permeable as brick is?"
-John Vallance, Considerations on the Expedience of Sinking Capital in Railways 1825
Examples of air-permeable
"A face liner for concrete comprises wood pulp with a water-absorptive, air-permeable surface substantially nonadherent to concrete on one side of the sheet."
-Paper Trade Journal 1943
"The taller the roughness elements of the ground, or the taller and less air-permeable the vegetative cover, the higher level at which zero velocity is found."
-WS Chepil & NP Woodruff - The Physics of Wind Erosion and its Control 1963
"Interior ribs are made of a higher air-permeable fabric (MIL-C-7020, Type I) for cross-cell venting."
-Dan Poynter, The Parachute Manual: A Technical Treatise on Aerodynamic Decelerators 1984
"Conversely, water vapour and air permeable fabrics do not readily provide barriers to chemical warfare agents. Air-permeable fabrics which are ideal in hot tropical climates, allow biting insects such as mosquitos to penetrate the fabrics." Richard A. Scott, Textiles in Defence 2000