Air Mine
Quite simply a highly toxic fart left in a room when its main occupant is not present, to be discovered later when the occupant returns. This form of warfare has been outlawed by NATO but is still in use in many urban office engagement zones.
I left an air mine for Richard and it almost killed him.
air mining
the act of pulling atmospheric carbon dioxide from the air for use in products or storage.
Climeworks is an air mining company pulling atmospheric carbon dioxide from the air at their plant in Hinwil, Switzerland.