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Weakest sound heard 0 dB normal conversation at 3-5 ft 60-70 dB dial tone of telephone 80 dB city traffic inside car 85 dB 1983 OSHA monitoring requirements begin 90 dB train whistle at 500 ft.90 dB subway train at 200 ft.95 dB regular sustained exposure may cause permanent damage 90-95 dB pneumatic riveter at 4 ft.125 dB
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