Noise contours reflecting aircraft noise at O’Hare International Airport have been projected since 1979. Shifting noise contours through the years at O’Hare are attributed to advancements in quieter aircraft technology and runway use.
The O'Hare Full Build-Out noise contour is based on FAA computer models of projected aircraft noise at the completion of the O'Hare Modernization Project (OMP). At the OMP's completion, the Chicago Department of Aviation will gather data from several sources, including the Airport Noise Management System, to validate the contour.
The data summarizes the Day-Night Average Sound Levels (DNLs). DNL is a 24-hour, time-averaged sound exposure level with a 110 decibel (dB) nighttime (10 p.m. to 7 a.m.) weighting to account for lower background noise levels during nighttime hours.
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