Airport noise emissions
Noise emissions describes the intensity and timing of noise due to airplane takeoffs and landing, and road traffic related to the airport activities.
These contents are from EUROCONTROL
Noise is generated by the engine (e.g. fan (front) and exhaust (rear)) and the airframe (e.g. body, wings, flaps, speed brakes and landing gear). On departure, high levels of thrust are used and so most of the noise is from an aircraft’s engines and this is typically the noisiest aircraft operation. Because the climb angle is usually steep, however, aircraft quickly reach a height above the ground where noise impact is less significant.On arrival, aircraft use much less thrust, but because they are using flaps and landing gear, airframe noise is equal to or greater than that of the engines. Although arriving aircraft are less noisy than on departure, they descend towards the runway on a shallow "glide slope" of typically 3 degrees (ICAO standard) and so are closer to the ground for a much greater distance from the airport. Aircraft also create noise on the ground when: taxiing, queuing, landing (especially when using reverse thrust), testing engines and when using the auxiliary power unit.
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Data for aircraft noise levels can be obtained from Federal Aviation Administration (U.S. Department of transportation)