2nd October 2019


What is an acceptable noise level?

With noise, OSHA's permissible exposure limit (PEL) is 90 dBA for all workers for an 8 hour day. The OSHA standard uses a 5 dBA exchange rate. This means that when the noise level is increased by 5 dBA, the amount of time a person can be exposed to a certain noise level to receive the same dose is cut in half.

How loud is 50 decibels?

Noise SourceDecibel Levelcomment
Quiet suburb, conversation at home. Large electrical transformers at 100 ft50One-fourth as loud as 70 dB.
Library, bird calls (44 dB); lowest limit of urban ambient sound40One-eighth as loud as 70 dB.
Quiet rural area30One-sixteenth as loud as 70 dB. Very Quiet
Whisper, rustling leaves20

How loud is 125 decibels?

Decibel (Loudness) Comparison Chart
Environmental Noise
weakest sound heard0 dB
pneumatic riveter at 4 ft.125 dB
jet engine at 100 ft.140 dB
loudest sound that can occur194 dB
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