Airport Noise Map - DNL Map

The intensity of sound can be mapped. Maps showing how loud a single noise was experienced over a geographic area can be made. This type of map would be made by contouring measured or estimated noise levels over the area where the sound was experienced.

Maps of airport noise are frequently prepared. The map above illustrates a measure of sound mapping know as DNL (day-night average sound level) for the area surrounding the Sky Harbor International Airport. It is a graphic illustration of noise levels from jet traffic superimposed on a city street map. DNL is the FAA's standard measure for determining cumulative exposure to noise. It is the average sound level in decibels over a 24-hour period with a 10 decibel penalty for noise occurring at night between 10:00 p.m. and 7:00 a.m.

Airport noise mapping is used to identify areas where assistance with noise control are needed. Many airports offer programs to replaces doors and windows in residences, install additional insulation or make other sound mitigating changes.

The Airport Noise Map above is from the City of Phoenix website.