Sound Pressure

dB

Sound Pressure

140 dB

(threshold of pain)

Jet engine (25 m distance

130

120

Jet take-off (100 m distance)

Rock concert

110

100

Jack hammer (close range)

Heavy truck

90

80

Average street traffic

70

Business office

Conversational speech

60

50

Living room

Library

40

30

Bedroom

20

10

0

Threshold of hearing