How many decibels of noise can a normal person accept? What are the consequences of excessive noise?

According to the relevant regulations, it can be found that the maximum human ear can withstand 8 consecutive hours is 85 decibels.

Left and right sound intensity, there is no negative effect. But if the decibel level of the sound has reached 125, then it will be a headache.

So under normal circumstances, a normal person can accept a decibel level below 40. If the decibel is too large, the eardrum.

It may rupture, and if the sound is too loud, it will cause corresponding damage to some internal organs of the human body. <>

According to experiments, if the noise exceeds 115 decibels, such as the sound of an airplane when it starts, then the cerebral cortex.

will decline. In particular, World Noise Day will promote noise pollution, which can also attract people's attention. If the noise reaches a certain decibels, it will have an impact on people's normal life, and the health impact of noise pollution is also very large.

In a quieter environment, such as a library or reading room, 40 to 60 decibels is a bit too high. <>

If the noise decibel is 60 to 70 decibels, it will affect the sleep and rest of the human body, and it will also affect the physiological function to a certain extent. If the noise reaches 100 decibels, then it will interfere with human life and cause upset. And the mind will not be concentrated, which is good for work efficiency.

It will also be reduced, and some accidents may occur. Reaching around 120 decibels is unbearable and can lead to temporary deafness. For example, a chainsaw is working, or a home stereo is turned on at maximum volume. <>

If the noise level of the aircraft reaches about 120 decibels, it will cause total deafness. And when it reaches more than 170 decibels, this environmental impact can lead to death. Moreover, being in a noisy environment for a long time can cause cardiovascular diseases in the human body.

For example, arteriosclerosis.

High blood pressure, coronary heart disease.

And the incidence will be about three times higher than that of the general population. Moreover, noise will have an impact on some visual organs and endocrine.

The sound is below 40 decibels, which has no effect on the human body; When the sound is between 40 and 60 decibels, the nervous system will be affected if the human body is in this environment for a long time. When the sound reaches 65 to 80 decibels, there is a high chance of nervous system and cardiovascular damage. When the noise exceeds 80 decibels, it can cause great damage to people's hearing.

When the noise exceeds 100 decibels, it is unbearable noise.

Sound above 90 decibels can cause damage to the ear, and the damage to the ear is proportional to the duration and intensity of the noise.

The acceptable decibel level for a normal person is between 30 and 120, and if it is too large, it will cause ear injury and even loss of hearing.

A noise level of 30 to 40 dB is a relatively quiet normal environment；More than 50 decibels will affect sleep and rest, due to insufficient rest, fatigue can not be eliminated, normal physiological functions will be affected; More than 70 decibels interfere with conversation, causing upset, affecting work efficiency, and even accidents; Long-term work or living in a noise environment above 90 decibels can seriously affect hearing and lead to the occurrence of other diseases.

0 decibels is the weakest sound one can just hear – the lower limit of hearing, and 10 decibels is equivalent to the rustle of leaves blown by the breeze. 30 to 40 dB is ideal for a quiet environment. Anything above 50 decibels can affect sleep and rest.

Above 70 decibels can interfere with conversation and affect work efficiency. Living in a noise environment of more than 90 decibels for a long time seriously affects hearing and causes neurasthenia, headaches, increased blood pressure and other diseases.

If suddenly exposed to noise up to 150 decibels, the auditory organs can be traumatized, causing the eardrum to rupture and hemorrhage, and the hearing in both ears is completely lost. In order to protect hearing, noise should be controlled not to exceed 90 decibels; In order to ensure work and study, the noise should be controlled not to exceed 70 decibels, and in order to ensure rest and sleep, the noise should be controlled not to exceed 50 decibels.

Related Notes:

In China, the relevant standards stipulate that the noise in residential areas should not exceed 55 decibels during the day and 45 decibels at night.

In order to prevent noise, Professor Ma Dayou, a famous acoustician in China, has summarized and studied the hazards and standards of various types of noise at home and abroad, and put forward three suggestions:

In order to protect people's hearing and physical health, the permissible value of noise is 75 to 90 decibels.

To ensure conversation and communication, the permissible value of ambient noise is 45 to 60 decibels.

For sleep time is recommended at 35-50 decibels.

More than 60 decibels is considered noise.

Basic concept: decibels, decibels are the unit of magnitude of the sound pressure level (symbol: db), for every doubling of the sound pressure, the sound pressure level increases by 6 decibels.

1 decibel is the sound that the human ear can just hear, the sound below 20 decibels, generally speaking, we think it is quiet, of course, generally below 15 decibels, we can consider it to belong"Dead silence"of. 20-40 decibels is about the whisper in a couple's ear. 40-60 decibels is our normal conversational sound.

More than 60 decibels belong to the noisy range, 70 decibels we can think that it is very noisy, and begin to damage the hearing nerve, more than 90 decibels will make hearing impaired, and stay in a space of 100-120 decibels, if there is no accident, a minute human beings will be temporarily deaf (deaf). The noise of a car is between 80 and 100 decibels, taking a car emitting 90 decibels as an example, at a distance of 100 meters, a noise of 81 decibels can still be heard (the above standards will vary depending on the environment, and are not absolute).

What is noise? To put it simply, irregular sounds can be understood as noise. There are several main types of urban noise, one is construction noise, which is phased.

The other is traffic noise, which lasts for a long time. The third type of noise is the noise of our lives, such as the noise of entertainment venues, the sound of playing mahjong, **TV, etc.

Among these kinds of noise, the most difficult to deal with is car noise, and by dealing with car noise, it is theoretically possible to solve the problem of living noise at the same time, of course, low-intensity construction noise can also be solved. But all I can say about the sound of piling is that it is very difficult to deal with at the moment, except that they are not able to renovate our homes to soundproofing standards in the soundproofing room, except that they are downtime for a limited time.

First of all, we need to understand a basic concept: decibels, decibels are the unit of size of the sound pressure level (symbol: db), and every time the sound pressure is doubled, the sound pressure level increases by 6 decibels.

1 decibel is the sound that the human ear can just hear, the sound below 20 decibels, generally speaking, we think it is quiet, of course, generally below 15 decibels, we can consider it to belong"Dead silence"of. 20-40 decibels is about the whisper in a couple's ear. 40-60 decibels is our normal conversational sound.

More than 60 decibels belong to the noisy range, 70 decibels we can think that it is very noisy, and begin to damage the hearing nerve, more than 90 decibels will make hearing impaired, and stay in a space of 100-120 decibels, if there is no accident, a minute human beings will be temporarily deaf (deaf). The noise of a car is between 80 and 100 decibels, taking a car emitting 90 decibels as an example, at a distance of 100 meters, a noise of 81 decibels can still be heard (the above standards will vary depending on the environment, and are not absolute).

The noise in the residential room should not exceed 50 decibels during the day and 45 decibels at night. Generally, when the noise is about 30 decibels, it will not affect normal life and rest, but when it reaches more than 50 decibels, it will be difficult to fall asleep. 10-20 dB is almost imperceptible; 20-40 decibels is like whispering, and 40-60 decibels is the standard for ordinary indoor conversation; 60-70 decibels can damage nerves; 70-90 dB nerve cells will be destroyed; 90-100 dB until hearing is impaired.

30～60

Leaves fall at 10 decibels, and normal conversation has 50 decibels. The sound of a car driving is 80 decibels. The sound of a truck is 90 decibels. The sound of forklifts and tractors is 100 decibels. The sound of chainsaws and cutters is 110 decibels.

The strength of the sound is measured in decibels. The average person should live in an environment of 50 decibels. If you live in an environment of 80 decibels, you will feel irritable.

The volume of the cutter can reach 100 120 decibels, and over time, you will feel dizzy, insomnia, hearing loss, and even deafness.

How many decibels of sound do we define as noise? 70 decibelsHuman beings are in the environment above how many decibels for a long time, their hearing is easily damaged, and their mood is easily irritable and restless above 70.

How many decibels of sound can directly damage the auditory nerve and even burst the eardrum? What is 130 decibels called noise? 1.Sounds that make people feel ugly and noisy. 2.More than 70 decibels are noise.

Below 60 decibels are acceptable.

Basic concept of noise: decibels. A decibel is a unit of magnitude (symbol: db) of sound pressure level, and for each doubling of sound pressure, the sound pressure level increases by 6 decibels.

1 decibel is the sound that the human ear can just hear.

Generally speaking, we think that the sound below 20 decibels is quiet, and of course, generally speaking, below 15 decibels, we can consider it to be "dead silent".

20-40 decibels is about the whisper of a human ear.

40-60 decibels is our normal conversational sound.

Above 60 decibels is in the noisy range.

At 70 decibels we can consider it very noisy and start to damage the hearing nerve.

Above 90 decibels can cause hearing damage.

The equivalent noise level is 55 dB during the day and 45 dB at night; The equivalent noise level is 60 dB in commercial and industrial mixed areas, and 50 dB at night; On both sides of the traffic arteries in the city, the equivalent noise level of noise is 70 decibels during the day and no more than 55 decibels at night.

According to medical experts, under normal circumstances, if the noise exceeds 50 decibels, the human nervous system will be affected if you are in this environment for a long time. For every 3 decibels of noise, noise energy is doubled.

Noise pollution is so severe that it can even damage the human auditory system. Often in the noise trouble, there will be memory loss, insomnia and other symptoms. Studies have shown that women who live or work near airports or railways for a long time have a significantly higher proportion of mental retardation and malformations than in other regions after pregnancy.

The maximum noise level for each construction activity is regulated, such as 92 decibels for carpenters, 85 decibels for grinders, etc. When the construction site noise exceeds 140 decibels, a part of the machinery must be stopped. Noise pollution is also becoming more and more serious in cities in some developing countries, with noise levels reaching 75-80 decibels throughout the day in some areas.

Studies have shown that human hearing can accept a maximum volume of 30 decibels, when the continuous noise pollution in the room exceeds 30 decibels, people's normal sleep will be disturbed, and continuous living in a noise environment above 70 decibels, people's hearing and physical health will be affected. New scientific research confirms that noise can also harm people's eyes, causing eye fatigue and vision loss.

When the noise intensity is 90 decibels, about half of the people will have dilated pupils and blurred vision; When the noise reaches or exceeds 110 decibels, almost all people's eyeballs have varying degrees of adaptation to light brightness. This is why people who live in noisy environments for a long time are particularly prone to eye fatigue, eye swelling and pain, eye dizziness, and visual tears.

The disturbance is between 22 p.m. and 6 a.m.

In accordance with the provisions of Article 63 of the Law on the Prevention and Control of Environmental Noise Pollution,)"Nighttime"Refers to the period between 22 p.m. and 6 a.m.

1. The night measurement of the first-class living area is more than 50 decibels, and the night measurement of the second-class living area is more than 65 decibels, as long as it exceeds 9 o'clock or 10 o'clock in the evening, it is disturbing the people, which belongs to noise pollution. If there is an act within these categories, it is a nuisance.

2. The decoration time in the community is from 12 o'clock to 14 o'clock and from 19 o'clock to 7 o'clock the next day to not disturb the people. The time set by each province varies, but it is much the same, and the operation of the residents during the normal rest time is considered a nuisance. The allowable decoration time is concentrated from 7 a.m. to 12 p.m. and from 2 p.m. to 7 p.m.

3. From 11 p.m. to 7 a.m. the next day, if the decibel is higher than 80 decibels, it is a disturbance.

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According to the regulations: from 22 o'clock in the evening to 6 o'clock in the morning, more than 40 decibels are considered as disturbing the people. 6 a.m. to 22 p.m., 50 decibels or more is considered a nuisance.

China's current national standard is GB 3096-2008 and "Acoustic Environment Quality Standard", which stipulates the environmental noise limits and measurement methods of five types of acoustic environment functional areas, which are suitable for acoustic environment quality evaluation and management.

Noise limits are specified:

Category: Daytime, Night.

Class 0 50 dB 40 dB.

Class 1: 55 dB, 45 dB.

Class 2: 60 dB, 50 dB.

Class 3 65 dB 55 dB.

Class 4 70 dB 55 dB.

The area where the various standards are applicable.

1) Category 0 standard is applicable to areas that need to be quiet such as recuperation areas, high-end villa areas, and high-end hotel areas. This type of area located in the suburbs and villages is strictly implemented at 5 decibels stricter than the 0 class standard.

2) Category 1 standards are applicable to areas dominated by residential, cultural and educational institutions. Rural living environments can refer to the implementation of such standards.

3) Category 2 standards are applicable to residential, commercial, and industrial mixed areas.

4) Category 3 standards apply to industrial zones.

5) Category 4 standards apply to road traffic in cities.