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 ...

But on one day of testing, noise inside a train traveling between Porter and Harvard peaked at 110 dBA, which, according to a chart produced ... which also records decibel levels emitted by ...

Which brings me on to the 27 dB of noise reduction – the highest level offered by any of Loop’s models to date. To be clear, noise reduction does not equal the effects of the best noise ...