One Square Inch of Silence is a noise control project symbolized by a small red stone symbolically placed in Hoh Rainforest at Olympic National Park in 2005 by author and sound recording specialist Gordon Hempton.[1][2][3] The stone's location has been called "the quietest place in the United States".[4][5][6] According to commercial pilot Philip Greenspun, some airlines have voluntarily rerouted flights to avoid inducing noise pollution at the square inch.[1] Hempton has formed a foundation to prevent jet aircraft noise in Olympic National Park and other parks.[4][7]
Hempton's works, including One Square Inch of Silence, were covered in the 2010 documentary Soundtracker which debuted at the Sedona Film Festival.[8][9]