An hourly average of the noise level (HNL) including number of flights per hour N is also used and defined as: HNL = SENEL + 10 log 10 N - 35.6 (dB) A variation in the calculation ... is shown in the ...

Sound levels are measured on a scale known as the decibel \(dB\) scale. The higher the number the greater is the sound level. Too much noise can damage hearing. Exposure to 90 decibel sound levels ...

However, in the situation with face-to-face conversation of non-familiar speech material, the following chart shows the speech ... and over 75 dB as unsatisfactory. Necessary voice levels as limited ...