How many decibels belong to noise, and how many decibels above is considered noise

1. If it is in schools, government agencies and villages, it is above 55 decibels during the day and above 45 decibels at night.

2. In areas that need to be quiet, such as recuperation areas and high-end villa areas, more than 5 decibels during the day and more than 4 decibels at night are noise.

3. In residential areas, commercial areas and industrial mixed areas, more than 6 decibels during the day and more than 5 decibels at night are called noise.

4. If it is an industrial area, it is more than 65 decibels during the day and more than 55 decibels at night for noise.

5. In the areas on both sides of urban road traffic, waterway inland rivers and railway trunk lines, more than 7 decibels during the day and more than 55 decibels at night are noise.

6. If you live or work in a noisy environment for a long time, it will cause noise deafness and tinnitus, and if it is noise deafness and tinnitus, it is irreversible hearing loss.

In general residential and commercial areas, more than 55 decibels during the day and more than 45 decibels at night are considered noise. 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; Above 70 decibels interfere with conversation, causing upset and impactProductivity, 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. Long-term living in a noisy environment above 90 decibels seriously affects hearing and causes neurasthenia.

Headaches, elevated 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, Ma Dayou, a famous acoustician in China.

The professor 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.

It is recommended to use 50 dB at 35.

Legal Analysis: Relevant provisions: The noise standard value of the residential, cultural and educational institutions and the rural living environment shall be 55 decibels during the day and 45 decibels 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.

Legal basis: "Environmental Noise Standards for Urban Areas of the People's Republic of China".

Article 64: This Law shall come into force on March 1, 1997. The Regulations of the People's Republic of China on the Prevention and Control of Environmental Noise Pollution promulgated on September 26, 1989 shall be repealed at the same time.

People's Republic of China Environmental Noise Standards for Urban Areas.

1 Subject content and scope of application.

This standard specifies the maximum limits for environmental noise in five types of urban areas.

This standard applies to urban areas. Rural living areas can be implemented with reference to this standard.

2 Criterion.

The standard values of urban Class 5 environmental noise are as follows:

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.

3 Applicable areas of various standards.

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 are applicable to the areas on both sides of the road traffic arteries in the city, and the areas on both sides of the inland waterway through the urban area. The same standard is also applied to the background noise (i.e., the noise level when the train does not pass) in the area on both sides of the main and secondary railway lines that pass through the urban area.

4 Sudden noise at night.

The maximum value of sudden noise at night shall not exceed the standard value of 15 decibels.

The People's Republic of China Industrial Enterprise Boundary Noise Standard.

1 Scope of application of the standard.

This standard applies to the boundaries of factories and enterprises and institutions that may cause noise pollution.

2 Criterion.

The standard values of noise at the boundary of various types of plants are as follows:

Category: Daytime, Night.

Class 1: 55 dB to 45 dB.

Class II: 60 dB, 50 dB.

Class III: 65 dB and 55 dB.

Class IV: 70 dB and 55 dB.

3. Delineation of the scope of application of various standards.

The first type of standard is applicable to areas dominated by residential, cultural and educational institutions.

The second category of standards applies to residential, commercial, industrial mixed areas and central business districts.

Category 3 standards apply to industrial zones.

Category 4 standards apply to areas on both sides of the traffic arteries.

4. The scope of application of various standards shall be delineated by local people.

5 Frequent bursts of noise (e.g., exhaust noise) at night. The peak value should not exceed the standard value of 10 decibels, and the peak value of the occasional sudden noise at night (such as a short whistle sound) should not exceed the standard value of 15 decibels.

Legal Analysis: The noise pollution standard is between 45 decibels and 55 decibels, and the volume exceeding this standard is considered noise nuisance. Property management enterprises shall stop the environmental noise pollution in the management area, and report to the supervision and management department of environmental noise pollution prevention and control in a timely manner.

Citizens can call 12369 to complain to the local environmental protection department, or contact the local city management department or 110 to negotiate a solution.

Legal basis: Environmental Noise Standards for Urban Areas.

1) "Special residential area" refers to a residential area that requires special quiet, and the standard environmental noise value is 45 decibels during the day and 35 decibels at night.

2) "Residential, cultural and educational areas" refers to purely residential areas and cultural, educational, and institutional areas, and the standard environmental noise value is 50 decibels during the day and 40 decibels at night.

3) "Class I mixed area" refers to the general commercial and residential mixed area, and the standard value of environmental noise is 55 decibels during the day and 45 decibels at night.

4) "Class II mixed area" refers to the mixed area of industry, commerce, traffic and residential, and "central business area" refers to the prosperous area where business is concentrated, and the standard environmental noise value of both is 60 decibels during the day and 50 decibels at night.

5) "Industrial concentration area" refers to an industrial zone clearly defined in the planning of a city or region, and its environmental noise standard value is 65 decibels during the day and 55 decibels at night.

6) "Both sides of the traffic artery" refers to the two sides of the road with a traffic volume of more than 100 vehicles per hour, and the standard environmental noise value is 70 decibels during the day and 55 decibels at night.

Legal basis: "Law of the People's Republic of China on the Prevention and Control of Environmental Noise Pollution" Article 6 The competent department of ecology and environment shall implement unified supervision and management of the prevention and control of environmental noise pollution nationwide. The competent departments of ecology and environment of the local people's governments at or above the county level shall implement unified supervision and management of the prevention and control of environmental noise pollution within their respective administrative areas.