Noise
How we perceive noise
1
The external ear
Headset and ear canal - pick up the noise and transmit the waves to the eardrum.
2
The middle ear
Eardrum and ossicles - intensifies sound signal and transmits it to the inner
ear.
3
The inner ear
Turn the sound signals into nerve impulses that sends to our brain.
Noise Levels
50 dB
Maximum noise level at night in a residential area.
70 dB
Maximum noise level during the day in a residential area.
140 dB
Pain threshold.
40dB
Residence or library.
50dB
Environmental music, rain noise...
60dB
A normal conversation.
80dB
Some domestic appliances.
100dB
Motorcycle, ambulance, crying baby...
150dB
Noise of an airplane taking off.
In a residential area, the maximum allowable global level is...
65dB
During the day 7 - 23h
55dB
During the night23 - 7h
In a residential area, the maximum allowable global level is...
75dB
During the day 7 - 23h
65dB
During the night 23 - 7h
Sources of noise pollution
80%
Freeway traffic
10%
Industrial activity
6%
Railway traffic
4%
Recreational activities
Effect in human health
Anxiety and irritability
Lack of concentration, accidents...
Decreased hearing
Sleep disorders
Changes in heart rhythm