Note
11
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Table 3
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
2.0 to 3.0
2.0.
3.5 to 4.5
1.5
5.0 to 7.0
1.0
7.5 to 12.0
0.5
more than 12.0
0
When using Table 3 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.
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