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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlikeLice nse. Your use of this material constitutes acceptance of that license and the conditions of use of materials on this 2006, The Johns Hopkins University, Patrick Breysse, and Peter S. J. Lees. All rights reserved. Use of these materials permitted only in accordance with license rightsgranted. Materials provided AS IS ; no representations or warranties provided. User assumes all responsibility for use, and all liability related thereto, and must independently review all materials for accuracy and efficacy. May contain materials owned by others. User is responsible for obtaining permissions for use from third partiesas N. Breysse, PhD, CIHP eter Lees, PhD, CIHJ ohns Hopkins UniversitySection AIntroduction and DefinitionsNoise and Sound Noise Excessive or unwanted sound which potentially results in annoyance and/or hearing loss (can be from occupational and/or non-occupational sources) Sound A pressure variation (wave) that travels through air and is detected by the human earContinued4 Noise and Sound Physical manifestation of noise is a pressure wave Caused by vibrating surfaces W

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike License. Your use of this ... Introduction and Definitions. Noise and Sound ... pressure measured in decibels (dB)

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