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Appendix - Typical 'A' Weighted Sound Levels
50 HP Siren (100')
Jet take-off (200')
Riveting machine
Subway (20')
Pneumatic drill (50')
Vacuum cleaner (10')
Large store
Small office
Residential area (night)
Whisper (5')
Threshold of hearing
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
11
Chain saw
Boiler room
Freight train (100')
Speech (1')
Large Office
Residence
Sound studio
Model 407764 Version 1.4 December 2004
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