The Noise Remedy Boundary is established under FAA guidelines utilizing noise modeling and the required Day-Night average sound Level (DNL) noise metric. DNL is a 24-hour average (measured in decibels). Nighttime noise is weighted at a level 10 times that of daytime noise in calculating DNL.
The FAA has determined that a DNL level of at least 65 dB DNL is required before a home is potentially eligible for sound insulation. A 65 dB DNL noise contour is produced using sophisticated noise modelling, which is the FAA-required method, and this contour forms the basis for the Noise Remedy Boundary which aligns to street and cul-de-sac for neighborhood inclusion.
