You searched for: “soil air”
soil atmosphere, soil air (s)  (noun), soil atmospheres (pl)
In geology, The air occupying the pore or open spaces in soil: Soil atmosphere can be a gas located in the pores or cavities in the soil or, in other words, in the zone of aeration.
This entry is located in the following units: soil- + (page 1) sphero-, spher-, -sphere- (page 11)