Gobs of air come away from the sky when congealed boredom is applied to it. The pockets of vacuum are dangerous to birds, children, and other flying objects. Those pockets can be herded into Abscence Farms by any of the techniques developed by Mrs. Landgrave's Kindergarten R&D Labs.
The gobs of air, themselves, are soluble in soil and grass and are flammable in sea water. Special care must be taken that they are removed in specially designated locations.