The Sacramento County Airport System periodically conducts noise studies to assess the noise impacts of aircraft operations. The need to conduct a noise study is generally prompted by a significant change in aircraft operations--either the number of operations conducted at the airfield, the number and type of aircraft using the airfield or the flight paths used for airfield departure/arrival changes.

Calculated noise contours do not represent exact measurements. Noise levels inside a contour may be similar to those outside a contour line.