How many decibels can the human ear withstand. Permissible noise standards in the apartment Permissible decibel norm for a person

]Usually, decibels are used to measure the loudness of a sound. A decibel is a decimal logarithm. This means that increasing the volume by 10 decibels indicates that the sound has become twice as loud as it was originally. The loudness of a sound in decibels is usually described by the formula 10Log 10 (I/10 -12), where I is the sound intensity in watts/square meter.

Steps

Comparative table of noise levels in decibels

The table below describes the decibel levels in ascending order, and their corresponding sound source examples. Information is also provided on the adverse effects on hearing against each noise level.

Decibel levels for different noise sources

decibels	Source example	Health impact
0	Silence	Missing
10	Breath	Missing
20	Whisper	Missing
30	Quiet background noise in nature	Missing
40	Sounds in the library, quiet background noise in the city	Missing
50	Quiet conversation, typical suburban background noise	Missing
60	Office or restaurant noise, loud conversation	Missing
70	TV, highway noise from 15.2 meters (50 feet) away	The note; unpleasant to some
80	Noise from factory, food processor, car wash from 6.1 meters (20 feet) away	Possible hearing damage from prolonged exposure
90	Lawn mower, motorcycle from a distance of 7.62 m (25 ft)	High chance of hearing damage with prolonged exposure
100	Boat motor, jackhammer	High risk of severe hearing damage with prolonged exposure
110	Loud rock concert, steel mill	It may hurt right away; very high risk of severe hearing damage with prolonged exposure
120	Chainsaw, thunder	Usually there is immediate pain
130-150	Fighter takeoff from an aircraft carrier	Possible immediate hearing loss, or rupture of the eardrum.

Sound level measurement with instruments

Use your computer. With special programs and equipment, it is easy to measure the noise level in decibels directly on the computer. Listed below are just some of the ways this can be done. Note that using better recording equipment will always give better results; in other words, your laptop's built-in microphone may be sufficient for some tasks, but a high-quality external microphone will produce more accurate results.

Use the mobile app. To measure the sound level in any place, mobile applications will come in handy. The microphone on your mobile device will likely not perform as well as an external microphone connected to your computer, but it can be surprisingly accurate. For example, reading accuracy on a mobile phone may well differ by 5 decibels from professional equipment. Below is a list of programs for reading the sound level in decibels for different mobile platforms:
- For Apple devices: Decibel 10th, Decibel Meter Pro, dB Meter, Sound Level Meter
- For Android devices: Sound Meter, Decibel Meter, Noise Meter, deciBel
- For Windows phones: Decibel Meter Free, Cyberx Decibel Meter, Decibel Meter Pro
Use a professional decibel meter. It's usually not cheap, but it's probably the easiest way to get accurate measurements of the sound level you're interested in. Also referred to as a "sound level meter", this is a specialized device (available online or in specialized stores) that uses a sensitive microphone to measure the noise level around and gives an accurate decibel reading. Since these devices are not in high demand, they can be quite expensive, often starting at $200 even for entry-level devices.
- Note that the decibel/sound level meter may call it something different. For example, another similar device called a "noise meter" does the same thing as a sound level meter.
Mathematical calculation of decibels
1. Find out the sound intensity in watts/square meter. In everyday life, decibels are used as a simple measure of loudness. However, everything is not so simple. In physics, decibels are often viewed as a convenient way of expressing the "intensity" of a sound wave. The greater the amplitude of the sound wave, the more energy it transmits, the more air particles vibrate in its path, and the more intense the sound itself. Due to the direct relationship between the intensity of a sound wave and the loudness in decibels, it is possible to find the decibel value by knowing only the intensity of the sound level (which is usually measured in watts/meter squared)
  - Note that for normal sounds the intensity value is very low. For example, a sound with an intensity of 5 × 10 -5 (or 0.00005) watts/meter square corresponds to approximately 80 decibels, which is approximately the volume of a blender or food processor.
  - To better understand the relationship between intensity and decibel level, let's solve one problem. Let's take this as an example: let's say that we are sound engineers and we need to get ahead of the background noise level in a recording studio in order to improve the quality of the recorded sound. After installing the equipment, we fixed the background noise with an intensity 1 × 10 -11 (0.00000000001) watt/square meter. Using this information, we can then calculate the background noise level of the studio in decibels.
2. Divide by 10 -12. If you know the intensity of your sound, you can easily plug it into the formula 10Log 10 (I/10 -12) (where "I" is the intensity in watts/meter squared) to get the value in decibels. To start, divide 10 -12 (0.000000000001). 10 -12 displays the sound intensity with a rating of 0 on the decibel scale, comparing your sound intensity with this number you will find its relation to the initial value.
  - In our example, we divided the intensity value 10 -11 by 10 -12 and got 10 -11 / 10 -12 = 10 .
3. Calculate Log 10 from this number and multiply it by 10. To complete the solution, all you have to do is take the base 10 logarithm of the resulting number and then finally multiply it by 10. This confirms that decibels are logarithmic to base 10—in other words, a 10 decibel increase in noise level means doubling sound volume.
  - Our example is easy to solve. Log 10 (10) = 1. 1 × 10 = 10. Therefore, the background noise value in our studio is 10 decibels. It's quiet enough, but still picked up by our high quality recording equipment, so we probably need to eliminate the source of the noise in order to achieve higher quality recordings.

To feel comfortable and peaceful, a person does not need absolute silence. The complete absence of sounds will not bring peace of mind, and such a state of the environment is not silence (in the usual sense of the word). The world, filled with subtle, often not perceived by the consciousness, rustles and halftones allows you to take a break from the noise and bustle of the mind and body. However, many sounds of different strength and beauty fill people's lives, bringing joy, providing information, simply accompanying the necessary actions.

How to understand that while enjoying you do not interfere with others and do not harm yourself? How to eliminate annoying and negative influence from the outside? To do this, it is useful to know and understand scientifically established noise standards.

What is noise

Noise is a physical and multi-valued quantity (for example, digital noise in images). In modern science, this term denotes non-periodic oscillations of a different nature - sound, radio, electromagnetic. Previously, in science, this concept included only sound waves, but then it became wider.

Most often, noise means a complex of irregular sounds of different frequencies and heights, and from the point of view of physiology, any unfavorably perceived acoustic phenomenon.

Noise unit

The noise level is measured in decibels. A decibel is a tenth of a bela, which is practically not used. It characterizes the relationship to each other of two physical (energy or power) quantities of the same name - that is, power to power, current to current. One of the indicators is taken as the initial one. It can be simply a reference or generally accepted, and then they talk about the level of the phenomenon (an example is the power level).

For those unfamiliar with mathematics, it will be clearer that an increase in any initial value by 10 dB for the human ear means twice as loud as the initial sound, by 20 dB - four times, and so on. It turns out that the sound heard by a person is a billion times weaker than the loudest. The use of such a notation greatly simplifies the recording, eliminating many zeros, and facilitates the perception of information.

Bel originates from the methods used to estimate the attenuation of the telephone and telegraph signal in the respective transmission lines. Named after an American scientist of Canadian origin Alexander Graham Bell, who is one of the pioneers of telephony, the author of many inventions and the founder of the world's largest media conglomerate American Telephone and Telegraph Company, as well as a major research center Bell Laboratories.

The ratio of numbers and life phenomena

To understand the numerical expression of the noise level, you need to have accurate guidelines. Without application to familiar life phenomena, numbers will remain abstract signs.

Sound source	Value in decibels
Calm normal breathing	10
rustle of leaves	17
Whispering / flipping newspaper sheets	20
Quiet noise background in nature	30
Quiet (normal) noise background in an urban apartment building, the sound of calm sea waves rolling ashore	40
calm conversation	50
Sounds in the room of a not very large office, restaurant hall, rather loud conversation	60
Most common TV sound level, busy highway noise from ~15.5 meters away, loud speech	70
A working vacuum cleaner, a factory (feeling outside), a train in the subway (from the car), talking in raised tones, children crying	80
Working lawn mower, motorcycle from a distance of ~ 8 meters	90
Started motorboat, jackhammer, active traffic	100
Loud screaming baby	105
Heavy music concert, thunderclap, steel mill, jet engine (from 1 km away), subway train (from platform)	110
Loudest snoring on record	112
Pain threshold: chainsaw, shots from some guns, jet engine, car horn up close	120
Vehicle without muffler	120-150
Fighter taking off from an aircraft carrier (at a distance)	130-150
Working hammer drill (in close proximity)	140
rocket launch	145
Supersonic aircraft - shock sound wave	160
Lethal Level: Massive Volcanic Eruption	180
Artillery shot 122 mm	183
The loudest sound made by a blue whale	189
Nuclear explosion	200

The impact of noise on the human body

The negative impact of noise on people has been confirmed by many studies. In ecology, a very eloquent concept of "noise pollution" has even formed.

Noise levels above 70 dB with long-term exposure are likely to cause disorders of the central nervous system, changes in blood pressure, headaches, metabolic disorders, malfunctions of the thyroid gland and digestive organs, impair memory, the ability to concentrate and, of course, reduce hearing . Noise exceeding 100 dB can lead to absolute deafness. Intense and prolonged exposure can provoke

Every 10 dB increase in average noise raises blood pressure by 1.5-2 mmHg, and the risk of stroke increases by 10%. Noise leads to earlier aging, reducing the lives of the population of large cities by 8-12 years. According to experts, the permissible noise level in megacities is significantly exceeded: by 10-20 dB near iron roads and by 20-25 dB near medium-sized highways, by 30-35 dB in apartments whose windows do not have sound insulation and overlook major highways.

The results of studies by the World Health Organization showed that 2% of all human deaths were the result of diseases caused by excessive noise. The danger is also those sounds that are not perceived by the human ear - lower or higher than a person is able to hear. The degree of impact depends on their strength and duration.

Noise level during the day

In addition to federal laws, it is also possible to adopt local legislative acts that tighten the nationwide regulations. Russian legislation provides for a noise level limit that differs during the day and night, as well as on weekdays and weekends / holidays.

On weekdays, daytime will be from 7.00 to 23.00 - noise up to 40 dB is allowed (exceeding a maximum of 15 dB is allowed).

From 13.00 to 15.00 the noise level in the apartment should be minimal (complete silence is recommended) - this is the official afternoon rest time.

On weekends, the schedule also changes slightly - daily rates are valid from 10.00 to 22.00.

Repair work in residential apartment buildings is allowed only on weekdays during the time period from 9.00 to 19.00 with a mandatory one-hour lunch break (in addition to complete silence from 13.00 to 15.00), and their total duration should not exceed 6 hours. Complete renovation in the apartment should be within 3 months.

industrial premises - noise level up to 70 dB;
open-type offices (partitions between workplaces do not reach the ceiling) - up to 45 dB;
closed type offices - up to 40 dB;
conference rooms - up to 35 dB.

Is it possible to make noise at night?

During sleep, human hearing sensitivity increases by almost 15 dB. According to the World Health Organization, people become irritable if they are affected by sounds of only 35 dB in their sleep, 42 dB noise leads to insomnia, and 50 dB leads to diseases of the cardiovascular system.

Night time on weekdays is considered part of the day from 23.00 to 7.00, on weekends and holidays from 22.00 to 10.00. The noise level should not exceed 30 dB (exceeding a maximum of 15 dB is permissible).

In exceptional cases, violation of established norms is allowed, these include:

capture of criminals;
actions taken under force majeure circumstances, during emergency situations and natural disasters, as well as to eliminate their consequences;
holding city-wide celebrations with the launch of fireworks, concerts.

Noise level measurement

Is it possible to independently determine the number of dB? Determining the noise level is very simple on your own, without professional instruments. For this you can:

apply a special program for a computer;
install the appropriate mobile application on the phone.

True, the results of these measurements can only be used for personal needs.

For a more accurate study, it is better to use the equipment designed for this - a sound level meter (often it can also be found under the name "sound level meter"). However, if you need to prove a violation of the rules for official proceedings, you will have to call a specialist with the same device.

There are sound level meters of 4 classes of accuracy and, accordingly, cost.

In order to most accurately determine the noise level in the measurement area, it must be taken into account that the device should not be used at temperatures below -10 °C and above +50 °C. Humidity in the room should not exceed 90%, and atmospheric pressure should not be between 645 and 810 millimeters of mercury.

Where to go if you need to measure the noise

Measurements can be carried out by representatives of forensic organizations, but only on the basis of a court order. Research is carried out by representatives of Rospotrebnadzor or third-party organizations accredited by it for this activity. Design organizations, members of builders' organizations working on the principles of self-regulation (SRO) will help - for the legitimate activities of construction companies, joining such non-profit associations is a prerequisite.

Who to complain to if the noise bothers you

You can contact the police - by calling the duty phone or by calling the district police officer. In some cases, especially when it comes to noise disturbances during repairs, it makes sense to call the representatives of the utility company servicing the house. Sometimes it is advisable to contact the prosecutor's office. You can also complain to Rospotrebnadzor or the authorities of the sanitary and epidemiological station.

Sound, like a signal, has an infinite number of vibrations and can carry the same infinite amount of information. The degree of its perception will be different depending on the physiological capabilities of the ear, in this case, excluding psychological factors. Depending on the type of noise, its frequency and pressure, a person feels its influence on himself.

Threshold of sensitivity of the human ear in decibels

A person perceives the frequency of sound from 16 to 20,000 Hz. The eardrums are sensitive to the pressure of sound vibrations, the level of which is measured in decibels (dB). The optimal level is from 35 to 60 dB, noise of 60-70 dB improves mental work, more than 80 dB, on the contrary, weakens attention and impairs the thinking process, and long-term perception of sound above 80 dB can cause hearing loss.

A frequency of up to 10-15 Hz is infrasound, not perceived by the ear, which causes resonant vibrations. The ability to control the vibrations that sound creates is the most powerful weapon of mass destruction. Inaudible to the ear, infrasound is able to travel long distances, transmitting orders that make people act according to a certain scenario, cause panic and horror, make them forget about everything that has nothing to do with the desire to hide, to escape from this fear. And with a certain ratio of frequency and sound pressure, such an apparatus is capable of not only suppressing the will, but also killing, injuring human tissues.

Threshold of absolute sensitivity of the human ear in decibels

The range from 7 to 13 Hz emit natural disasters: volcanoes, earthquakes, typhoons and cause a feeling of panic and horror. Since the human body also has a frequency of oscillation, which ranges from 8 to 15 Hz, with the help of such infrasound it costs nothing to create a resonance and increase the amplitude tenfold in order to drive a person to suicide or damage internal organs.

At low frequencies and high pressure, nausea and stomach pain appear, which quickly turn into serious disorders of the gastrointestinal tract, and an increase in pressure to 150 dB leads to physical damage. Resonances of internal organs at low frequencies cause bleeding and spasms, at medium frequencies - nervous excitation and injury to internal organs, at high frequencies - up to 30 Hz - tissue burns.

In the modern world, the development of sound weapons is actively underway, and, apparently, it was not in vain that the German microbiologist Robert Koch predicted that it would be necessary to look for a “vaccination” from noise like from plague or cholera.

There are different levels of noise and its permissible limits, the excess of which poses a great danger to human hearing.

How is noise measured?

Noise, like sounds, is measured in decibels (dB). According to the law of the Russian Federation, there are established norms that cannot be exceeded. In the daytime - no more than 55 decibels, at night - no more than 45 dB. These are the maximum permissible values, since their increase negatively affects human health. The nervous system suffers mainly, headaches occur.

Why are high pitched sounds dangerous?

Noise levels may vary. Some do not exceed the norms established by law and do not interfere with human life. In the daytime, a higher level of sounds is allowed, but it also has its limits in decibels. If the norm is exceeded, then a person may feel nervousness, irritability. Reactions are slowed down, productivity and ingenuity decrease.

Noise above 70 decibels can cause hearing loss. Especially loud sounds have a strong impact on the health of babies, the disabled and the elderly. According to studies of the impact of noise on humans, the reaction of the nervous system to an increase in the permissible levels of background noise starts from 40 decibels. Sleep is disturbed already at 35 dB.

Strong changes in the nervous system occur with noise of 70 decibels. In this case, a person may experience mental illness, hearing and vision deteriorate, and even the composition of the blood can change in a negative direction.

For example, in Germany, almost twenty percent of workers work in noise levels between 85 and 90 decibels. And this led to more frequent cases of hearing loss. Constant noise exceeding the norm entails at least drowsiness, fatigue and irritation.

What happens to hearing when exposed to noise?

Prolonged or excessively loud background noise can damage a person's hearing aid. The most dangerous thing in this case is the rupture of the eardrums. Accordingly, hearing is reduced or complete deafness occurs. In the worst case, with a loud explosion, the sound level of which reaches 200 decibels, a person dies.

Norms

The maximum noise level in a residential area (at any time of the day) is set in accordance with sanitary requirements. Sound over 70 decibels and above is harmful not only to the psychological, but also to the physical condition of a person. At enterprises, the noise level is regulated in accordance with sanitary standards and hygiene requirements established in the Russian Federation.

The optimal background noise is considered to be 20 decibels. For comparison, urban noise averages between 30 and 40 dB. And the maximum allowable for airliners is 50 dB above the ground. Now on many city streets noise levels reach from 65 to 85 decibels. But the most common indicators are from 70 to 75 dB. And this is at a rate of 70 dB.

High noise level (dB) is 90. It causes headaches, increases blood pressure, etc. Areas with increased noise levels include residential areas near airports, industrial enterprises, etc. In construction sites, the permitted level of increased sounds is not must exceed 45 decibels.

The main sources of noise are cars, aviation and railway transport, industrial production, etc. The average noise background on the roads of large cities is from 73 to 83 decibels. And the maximum is from 90 to 95 dB. In houses located along highways, the noise can reach from 62 to 77 decibels.

Although, according to sanitary standards, the sound background should not exceed 40 dB during the day, and 30 dB at night. According to the Ministry of Transport, about thirty percent of the population lives in the noise discomfort zones in the Russian Federation. And from three to four percent of the citizens are under the aviation sound background.

Low-intensity noise levels from urban traffic that are heard in residential areas are approximately 35 decibels. It does not cause physiological changes in people. At a sound level of 40 decibels, a change in hearing sensitivity begins after ten minutes. Under the influence of constant noise within fifteen minutes, sensations return to normal. At 40 dB, the duration of restful sleep is slightly disturbed.

At the factory where the press works, a special muffler is installed on it. As a result, noise is reduced from 95 to 83 decibels. And it becomes below the established sanitary standards for production.

But mostly people suffer from car noise. In cities where there is a busy traffic, the sound background is somewhat higher than the norm. During the passage of powerful trucks, the noise reaches its maximum value - from 85 to 95 decibels. But on average, in large cities, the excess of the permissible norm ranges from 5 to 7 decibels. And only in private sectors the noise load meets the accepted standards.

Technological progress causes an increase in artificial sound background, which in this case becomes harmful to humans. In some industries, the noise level in the room reaches from 60 to 70 decibels and above. Although the norm should be a value of 40 dB. All working mechanisms create a lot of noise, propagated over a long distance.

This is especially noticeable in the mining and metallurgical industries. In such industries, noise reaches 75 to 80 decibels. From explosions and operation of turbojet engines - from 110 to 130 dB.

What does the sanitary noise standard include?

Sanitary noise standards include many factors. The frequency characteristics, duration and time of exposure to a loud sound background, its nature are measured. Measurements are taken in decibels.

The norms are based on the characteristics of what level of noise, acting even for a long time, does not cause negative changes in the human body. During the day it is no more than 40 decibels, and at night - no more than 30 dB. Permissible limit of traffic noise - from 84 to 92 dB. And over time, the established norms of the sound background are planned to be reduced further.

How to determine the noise level?

At night, getting rid of loud noise is quite simple. You can call the district or police squad. But in the daytime, determining the noise level is much more problematic. Therefore, there is a special expertise. A special sanitary and epidemiological commission from Rospotrebnadzor is called. And the outgoing noise is fixed in decibels. After measurements, an act is drawn up.

Noise standards during construction

During the construction of residential buildings, developers are required to provide premises with good sound insulation. Noise should not be more than 50 decibels. This applies to sounds transmitted through the air (a working TV, conversations of neighbors, etc.).

Comparative indicators of permissible noise

Short-term exposure to loud sounds up to 60 decibels is not dangerous for a person. Unlike systematic noise, which disturbs the nervous system. The noise levels (in dB) from various sources are described below:

human whisper - from 30 to 40;
refrigerator operation - 42;
movement of the elevator cabin - from 35 to 43;
ventilation "Breather" - from 30 to 40;
air conditioning - 45;
the noise of a flying airliner - 140;
playing the piano - 80;
forest noise - from 10 to 24;
flowing water - from 38 to 58;
noise of a working vacuum cleaner - 80;
colloquial speech - from 45 to 60;
supermarket noise - 60;
car horn - 120;
cooking on the stove - 40;
motorcycle or train noise - from 90;
repair work - 100;
dance music in nightclubs - 110;
baby crying - from 70 to 80;
lethal noise level for humans is 200.

The list shows that many of the sounds that a person encounters on a daily basis exceed the permissible noise level. Moreover, only natural sounds are listed above, which are almost impossible to avoid. And if at the same time additional decibels are added, then the sound threshold established by sanitary standards is sharply exceeded.

Therefore, rest is important. After working in industries where the noise level goes off scale, it is necessary to restore hearing. To do this, it is enough to spend as much time as possible in relaxing, calm places. For this, field trips are well suited.

How to measure noise in decibels?

The permissible noise level can be measured independently with the help of special items - noise meters. But they are very expensive. And fixing the level of sounds is carried out only by specialists, without the conclusion of which the acts will be invalid.

As mentioned above, aggressive noise exposure sometimes leads to eardrum rupture. For this reason, hearing deteriorates, sometimes to complete deafness. Although the eardrum can recover, the process is very long and depends on the severity of the damage.

For this reason, it is recommended to avoid prolonged exposure to noise. Periodically, you need to give your ears a rest: be in complete silence, go to the village (to the country house), do not listen to music, turn off the TV. But first of all, it is desirable to abandon all kinds of portable music players with headphones.

All this will help preserve our precious hearing, which will always serve faithfully. In addition, silence helps to restore the eardrums after injury.

Let's take the most important thing from there:

In accordance with the Code ( carefully read to the end, not paying attention to the region) of the Tomsk region on administrative offenses, the punishment entails the use of sound-reproducing devices at high volume, including those installed on vehicles, balconies or window sills, which violates the peace and quiet of citizens. The key words here are "peace and quiet". Let no one be confused by the reference to the regional law. Similar rules exist in almost every region. You can't make noise anywhere.

Most likely, an attentive reader noticed that we are talking about the Tomsk region. BUT. The most important thing here is "Let no one be confused by the reference to a regional law. Similar norms exist in almost every region.".

Without thinking twice, we climb into Google to find out what is in our region (in this case we are talking about Moscow). At the request "sanitary standards for sound" the first link is the site http://www.vash....

We carefully study the document. Let's move on to the most important:

6.3. Permissible values of sound pressure levels in octave frequency bands, equivalent and maximum sound levels of penetrating noise in the premises of residential and public buildings and noise in residential areas should be taken from Table. 3.

Here, in fact, is the table itself (excess removed):

Type of work activity, workplace

Times of Day

Sound pressure levels, dB, in octave bands with geometric mean frequencies, Hz

Sound levels and equivalent sound levels (in dBA)

Maximum sound levels L Аmax, dBA

Living rooms of apartments, living quarters of rest homes, boarding houses, nursing homes for the elderly and disabled, sleeping quarters in preschool institutions and boarding schools

Sanitary standards regulate the noise level both at night and during the day. We are interested in the column "Sound levels and equivalent sound levels (in dBA)" because the court case (see first link) featured a noise level of 41 decibels.

What is "Maximum Sound Levels" in this table? The maximum allowable sound levels (LAmax, dBA) are 15 decibels higher than the "normal" ones. For example, for living rooms of apartments, the permissible constant sound level in the daytime is 40 decibels, and the temporary maximum is 55.

These magic numbers do not yet say anything, since there is nothing to compare with.

We also climb into Google with the request "Noise Scale". Again, on the first link we find the site http://www.kakr... . Table on the page:

Decibel, dBA	Characteristic	Sound sources
0	I can not hear anything
5	Almost inaudible
10	Almost inaudible	the soft rustle of leaves
15	barely audible	rustle of leaves
20	barely audible	whisper of a person (at a distance of 1 meter).
25	Quiet	human whisper (1m)
30	Quiet	whisper, ticking of the wall clock. Permissible maximum according to the norms for residential premises at night, from 23 to 7 hours.
35	Quite audible	muffled conversation
40	Quite audible	ordinary speech. The norm for residential premises during the day, from 7 to 23 hours.
45	Quite audible	normal conversation
50	clearly audible	conversation, typewriter
55	clearly audible	Upper standard for class A office premises (according to European standards)
60	Noisy	Norm for offices
65	Noisy	loud talk (1m)
70	Noisy	loud conversations (1m)
75	Noisy	scream, laugh (1m)
80	Very noisy	scream, motorcycle with silencer.
85	Very noisy	loud scream, motorcycle with silencer
90	Very noisy	loud screams, freight railway car (seven meters away)
95	Very noisy	subway car (7 meters outside or inside the car)
100	Extremely noisy	orchestra, subway car (intermittently), thunder The maximum allowable sound pressure for the player's headphones (according to European standards)
105	Extremely noisy	in an airplane (until the 80s of the twentieth century)
110	Extremely noisy	helicopter
115	Extremely noisy	sandblaster (1m)
120	Almost unbearable	jackhammer (1m)
125	Almost unbearable
130	pain threshold	plane at the start
135	Contusion
140	Contusion	the sound of a jet plane taking off
145	Contusion	rocket launch
150	Contusion, injury
155	Contusion, injury
160	shock, injury	shock wave from a supersonic aircraft
At sound levels above 160 decibels, eardrums and lungs may rupture, more than 200 - death (noise weapon)