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Disclaimer

The following is a rudimentary procedure for calculating the reduction or increase of sound (noise) during propagation outdoors (free field) in order to predict the intensity levels of environmental noise at a projected distance from a variety of point sources.  The user is herein advised that acoustic projections in intimate proximity to a noise source have extreme non-linearity inherent with near field measurements.  Also, this hemispherical divergence calculation DOES NOT include corrections for atmospheric conditions, source size, topographical effects, reflections nor screening by obstacles.  For a more precise estimate of acoustic intensity levels with a change of distance, a qualified acoustician should be consulted.

Engineered Aeroacoustics, Inc. shall not be held liable for any erroneous interpretations of the data.