SPL Loudness Guide
130 dB Pneumatic Drill
120 dB Loud car horn 3
feet away
110 dB Airport
100 dB Alongside
railroad
90 dB Inside of bus
80 dB Busy road
70 dB Conversational
Speech
60 dB TV quietly on in
living room
50 dB Quiet office
40 dB Bedroom
30 dB Recording studio
20 dB Broadcasting
studio
10 dB Threshold of
hearing
0 dB