Many devices are available to get rid of Halothane vapours during anaesthesia. Theatre atmosphere is polluted with Halothane vapours during each expiration of the patient. When the anaesthetist is holding a mask on patient`s face, the vapour concentration is maximum around 25 cm. of the patient`s airway. Constant inhalations of these vapours are responsible for mishaps. Therefore, careful planned anaesthesia is safe for both the patient and the anaesthetist.