In addition, there are no universally accepted methods for developing aircraft noise contours or forrelating the acceptability of specific zones to specific land uses. It is therefore expected that noisecontour data for particular aircraft and the impact assessment methodology will be changing. Toensure that the best currently available information of this type is used in any planning study, it isrecommended that it be obtained directly from the Office of Environmental Quality in the FederalAviation Administration in Washington, D.C.
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