ASA Standards Working Groups

ANSI S12WG31

Working Group on Predicting Sound Pressure Levels Outdoors

Chair: ASA Standards

Scope: Develop standard method for calculating the attenuation of sound during propagation outdoors in order to predict the levels of noise at a distance from a large variety of sources. The method should be a general engineering procedure that includes the combined effects of: geometrical divergence, atmospheric absorption, the effects of variable ground impedance, the effects of refraction due to wind and temperature gradients, the effects due to thermal and mechanical turbulence, reflection from surfaces, as well as propagation through foliage.

Responsible for the following published standards:

• ASA/ANSI S12.62 – Acoustics – Attenuation of sound during propagation outdoors – Part 2: General method of calculation (a modified nationally adopted international standard)

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