title: Anaesthetic contamination.
mesh_terms: D000397:Air Pollution; D000777:Anesthetics; D006221:Halothane; D006801:Humans; D007362:Intensive Care Units; D009609:Nitrous Oxide; D009873:Operating Rooms
chemical_list: D000777:Anesthetics; D009609:Nitrous Oxide; D006221:Halothane