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 ...

Delcambre police officers will be equipped with decibel sound meters to enforce a new noise ordinance aimed at reducing ...

The decibel (dB ... only 20dB of noise would be considered a relatively quiet system, while a typical office environment is around 40-50dB, and comfortable hearing levels are said to be below ...