EQUIVALENT SOUND LEVEL
The Thumb rule to find the resultant sound level due to the sound produced from two or more noise levels, if the difference between the highest and next highest noise level is:
0–1 dB then add 3 dB to the higher level to give the total noise level
2–3 dB then add 2 dB to the higher level to give the total noise level
4–8 dB then add 1 dB to the higher level to give the total noise level
9
dB and over, then the noise level is unchanged (i.e. the higher level is the
total level)
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