The Countess of Mar asked Her Majesty's Government: What exposure standards currently apply to any synergistic effects of simultaneous exposure to numerous chemicals which may be experienced by aircraft passengers and crew during a contaminated air event in a reduced pressure environment. [HL1761]

Lord Davies of Oldham: None. European airworthiness regulations for aircraft and engine design are written in objective terms that stipulate that the air provided to the passenger and crew compartments must be free from harmful or hazardous concentrations of gases or vapours.

October 2005