Publication updates

B15 p219 (01/12/2018). General rule of thumb for noise levels.

In the Example icon, the first paragraph should read as follows:

If you have to raise your voice to be heard by someone 2 m away from you, then the noise level is in the range of 85 dB(A). If you have to raise your voice to be heard by someone who is 1 m away, then the noise level is likely to be in the range of 90 dB(A).

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