PDFTech ReportNPS/NRSS/NRR-2014/873VX-82/JT022VX-H2/KL640Aircraft noiseNoiseNoise sourcesAmbient noiseEnvironmental monitoringSound levelNational parksNational Parks Air Tour Management Act, 2000ArizonaUnited States. National Park ServiceSchulz, NoahLee, CynthiaMacDonald, JohnJohn A. Volpe National Transportation Systems Center (U.S.)United States. National Park Service. Natural Sounds and Night Skies DivisionAGR-PUBLIC AND TRIBAL LANDS-PUBLIC AND TRIBAL LANDSNTL-ENERGY AND ENVIRONMENT-Environment ImpactsNTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENTVolpe National Transportation Systems Center, Technical Reference CenterDuring the summer (September \u2013 October) of 2010, Volpe Center personnel deployed acoustic measurement system at Fo...