As airports expand, Boris asked for clarification on how the most recent survey findings on Attitudes to Noise from Aviation should be understood in relation to the 1986 survey that set a 57 dBA noise limit.  In his written reply,  Jim Fitzpatrick (Parliamentary Under-Secretary, Department for Transport) stated that the current expansion of Heathrow did not increase the “noise contour compared with summer 2002, a contour area of 127 sq km”. Click for the full written answer.