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We are virtually always subjected to sounds. Unwanted background sounds are sometimes called noise. When the sound level of this noise rises to higher levels, we refer to this as noise pollution.

The major difference is that CNEL can be measured using ordinary dBA readings (see Sound Level Meter), as opposed to the computer calculation of Effective Perceived Noise Level used in ... is shown in ...

The major difference is that CNEL can be measured using ordinary dBA readings (see SOUND LEVEL METER ... following chart for the CNEL scale (with approximate CNR and NEF values). Community has had ...