The Department for Transport is conducting research into cabin air fume events which involves capturing samples of cabin air during normal conditions and fume events and analysing them to see what substances they contain and in what concentrations. The independent Committee on Toxicity (a panel including toxicologists from various universities) completed a substantial review of evidence in September 2007 and concluded that the evidence available did not establish a link between cabin air and pilot ill health, but nor did it rule one out.