Volume 4, Issue 2, April 2008
Index of content:
4(2008); http://dx.doi.org/10.1121/1.2961168View Description Hide Description
In July 2007, the Acoustical Society of America published ANSI/ASA S12.68 American National Standard Methods of Estimating Effective A‐Weighted Sound Pressure Levels When Hearing Protectors are Worn. The standard is an advance relative to the Noise Reduction Rating (NRR) as currently mandated by the U.S. Environmental Protection Agency and it is also an advance relative to the standards that have been developed by the International Organization for Standardization (ISO). Since the promulgation of the EPA's hearing protection labeling rule in 1978, the Noise Reduction Rating has been criticized as overestimating the performance that users achieve in the workplace.