When the eight-hour time-weighted average (TWA) reaches 85 dB(A), employers are required to administer a continuing, effective hearing conservation program.
OSHA requires employers to take steps to reduce exposure levels when the TWA reaches 90 dB(A).
If it is determined that levels of noise exposure have reached the EAV, employers are required to implement a hearing conservation program.
If a significant change in hearing capabilities occurs (called a standard threshold shift) greater steps must be taken to ensure the employee is protected from high levels of noise exposure.
Employers must make hearing protection available to all employees who are exposed to noise levels of 85 dB(A) or greater.
As of right now, The American Occupational Safety and Health Administration has not officially published a list of appropriate, time-weighted EAV guidelines for employers to follow.
The goal is for employers to have these numbers to make a conscious effort to lower the amount of harmful exposure absorbed by their workers.