Date: September 23, 2019
Background Noise Correction Factor:
The adjusted value for the maximum noise level shall be obtained by adding the correction factor corresponding to the difference between the maximum permitted level and the background noise level, set out in the Table below, to the higher of the 2 noise levels.
Difference between 2 noise levels in decibels (A)
Correction factor in decibels (A)
(a) Below 2