1
18
Table 4
Summation of Noise Levels
Difference in dB(A)
between two noise
levels being summed |
Amount in dB(A) to add to the higher noise level
0 to 0.5
3.0
1.0 to 1.5
2.5
1
2.0 to 3.0
2.0
3.5 to 4.5
1.5
1
5.0 to 7.0
1.0
7.5 to 12.0
0.5
more than 12.0
0
Note: When using Table 4 noise levels should be summed in a pairwise
fashion and the final total rounded to the nearest whole dB(A),
with values of 0.5 or more being rounded upwards.