GUIDE TO COMMON NOISE LEVELS AND APPROPRIATE HEARING CLASS COMMON NOISE LEVELS
CLASS SYSTEM
Whisper
25dB
Class
SLC80 dB
For use in noise
Quiet office
50 – 60dB
1
10 – 13
Less than 90dB(A)
Restaurant
60 – 70dB
2
14 – 17
90 to less than 95dB(A)
50kW Electric motor
90dB
3
18 – 21
95 to less than 100dB(A)
Angle grinder
85 – 115dB
4
22 – 25
100 to less than 105dB(A)
Compressor
101 – 123dB
5
26+
105 to less than 110dB(A)
Diesel generator
107 – 111dB
Mining drill
108 – 113dB
Power saw
110dB
Rock drill
110dB
Threshold of discomfort
120dB
Threshold of pain
130dB
Jet aircraft from 50m away
140dB
Hammer on steel plate at 1m
160dB
Slap directly on the ear
170dB
Toy pistol fired next to ear
180dB
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