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The natural sound conditions found in a study area. Natural quiet is a subset of ambient noise. Traditionally, it is characterized by the total absence of human or mechanical sounds, but includes all sounds of nature, such as wind, streams, and wildlife. In a park environment, the National Park Service (NPS) on Page 74 of its Report to Congress defines natural quiet as the absence of mechanical noise, but containing the sounds of nature, such as wind, streams, and wildlife, as well as human-generated “self-noise” (e.g., talking, the tread of hiking boots on the trail, a creaking packframe, the rattle of pots or pans).

Source: http://www.volpe.dot.gov/acoustics/docs/1990-1999/1999-1.pdf

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