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* Approximate values of noise levels using practical examples
The following diagram shows noises found near us.
Approximate degree of noise levels can be seen with these examples.
* Noise levels and perception
Boiler making
Forginb, rivetting,
rock drilling
Crusher
Engine, large
motor
Noisy factory
Normal
machine
factory
Subway
Computer
Overhead
room
train
Typing
room
Many
Passenger
people
car
Few
Business
people
and
industrial
district
Suburb
Quiet
night
CHAPTER 4
(dB)
(Perception at site)
130
Painful to ear
120
110
Slight pain to ear
100
Want to cover ear
90
Conversation with
person in front of you
is not possible
80
Conversation is not
possible unless voice is
raised
70
Voice is raised
intentionally to converse
60
Loud, but normal
conversation is possible
50
Sound is always audible
and is disturbing
40
Quiet but not relaxing
30
Relaxing
20
Dead quiet
10
0
Source: "Heibon Sha, industrial Encyclopedia"
Characteristics
Near airplane engine
Automobile horn
(2 m away)
Train with open
window in tunnel
Train passing on
overhead tracks
Train passing through
shopping district
Shopping district with
heavy traffic
In busy office
Among quiet group
of pedestrians
In quiet group of
persons
In broadcasting studio
Sound of leaves
brushing against
each other
47
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