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Heathrow

In a moment. Secondly, there is a commitment not to increase the size of the area significantly affected by aircraft noise. We measure this by reference to the 57 dB noise contour, which is a measure of the average exposure to aircraft noise over a typical 16-hour day. We take as our benchmark the size of that area in 2002—the latest data available before publication of the 2003 White Paper—which was 127 sq km. Thirdly, there is an expectation that any airport development should be accompanied by measures to improve public transport access to the airport, particularly by rail.