Sound is closely related to our lives, but many people have no concept of the classification standards of sound and can only judge it through the auditory senses, such as quiet, normal, noisy, harsh, etc. So how to define noise using a standard? Today, Jinghuan Sound Insulation will share the standard definition of environmental noise in social life.
In the field of acoustics, noise is divided into 5 categories (categories 0 to 4). The specific standards are as follows:
Category 0: no higher than 50 decibels during the day and no higher than 40 decibels at night;
Category 1: no higher than 55 decibels during the day and no higher than 45 decibels at night;
Category 2: no higher than 60 decibels during the day and no higher than 50 decibels at night;
Category 3: no higher than 65 decibels during the day and no higher than 55 decibels at night;
Category 4: no higher than 70 decibels during the day and no higher than 60 decibels at night;
Applicable areas for various standards
Category 0 standards are suitable for areas that particularly require quietness, such as health care areas, high-end villa areas, and high-end hotel areas. Areas located in suburban areas and rural areas are subject to stricter standards of 5 decibels than Category 0.
Category 1 standards apply to areas dominated by residences and cultural and educational institutions. The rural living environment can refer to the implementation of such standards.
Category 2 standards apply to mixed residential, commercial, and industrial areas.
Category 3 standards apply to industrial areas.
Category 4 standards apply to areas on both sides of urban road traffic trunk roads and on both sides of inland waterways passing through urban areas. The background noise (referring to the noise level when no trains are passing through) limits for areas on both sides of the main and secondary railway lines that pass through urban areas also comply with this type of standard.
We usually use professional instruments to measure the decibel size of sound, but how do we distinguish the size of sound in our daily auditory perception? Quiet ring sound insulation will be described to you using the sounds we often perceive in our lives:
Sound sound pressure level Lp/dB human body experience
Normal people listen to the valve (100HZ pure tone) 0, almost no sound is heard
A well-designed anechoic chamber has a noise floor of 2 to 10 and is very quiet.
Quiet nursing home, villa, library, countryside 20~30 Quiet
Quiet communities and parks 30~40 relatively quiet
Usually office 50 average
Normal conversations and meetings in the living room 60 Noisy
Noisy students, phone ringing 70 Noisy
The sound of alarm clocks, urban rail transit, and square dancing 80 damage hearing nerves
The sound of machines and loud shouting in large production workshops 90~100 is harmful to health
Tractors, trains, KTV, nightclubs 100~110 seriously endanger health
Wind shovel, gun, rock music, trumpet sound, large disco bar, firecrackers, etc. 110~120 Long-term deafness
Jet engines, explosions, gunshots 120~140 Rupture of eardrums, deafness
Rocket launch 140+ deafening, causing death
Everyone should have a rough idea of the level of sound. Different areas have different requirements for sound. If it exceeds 60 decibels, it is considered noise. For people's daily life, a healthy living environment is considered to be no more than 60 decibels.
