Noise measurements relating to loud noise at work are more normally given in dB(A) or dB(C) – these are frequency weightings that are applied to the decibel measurements (A and C frequency weightings), in effect, they are decibel scale readings that attempt to replicate the sensitivity of the human ear to different frequencies of sound. For example, if your workplace noise level is 95 dB(A) and you add another process or piece of machinery that measures 80dB(A) on its own, the workplace noise level will still be 95dB (A). When the difference between two-decibel measurements is 10dB(A) or above, the amount added is Zero, this is because the contribution to the overall noise of the lower reading is not perceived by the human ear and therefore no adjustment factor is needed. Step 3: Add the number in the right-hand column to the highest of the two-decibel measurements you have. Step 2: Find the corresponding number in dB in the right-hand column. Step 1: Find out the difference between two noise levels and then find the corresponding row in the left-hand column. You can use this quick reference table to add noise levels together: Difference between two noise levelsĪmount to add to the higher of the two noise levels (dB or dB(A)) For instance, in a factory, if one machine’s noise level is measured at 90 dB(A) and then we start up a second machine also measuring 90 dB(A), the resulting noise is not 180 dB(A), instead, because we know that 3dB represents a doubling of the noise, 90dB + 90dB = 93dB.
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