What is the so called ash layer, the ash layer is generally in several layers

Raised ash layerGenerally on the 9th-11th floor.

The existence of the ash layer refers to the fact that due to the influence of air flow and the building microenvironment, part of the dust density of the building within a certain height range is larger", and this height is about 30 meters above the ground, that is, about 10 floors.

But in fact, dust can be lifted by the movement of air currents in the atmosphere, which is what we call wind. Dust also has weight, and without the action of wind, they will also eventually fall. The movement of each particle of dust is affected by multiple factors such as wind speed, wind direction, terrain, air temperature, humidity and so on.

The generation of the raised ash layer

The emergence of the ash layer originated from the concept created by the sales staff of the sales department to narrow the range of home buyers to choose a house. So as to meet the demand for a quick sale of the house. At the same time, when the ash layer was first proposed, 18-storey high-rise residential buildings were still very popular in the market.

It happens that among the 18-storey residences, the 9th-11th floors are a good floor. At that time, housing prices were not very high, and all the natural ash layer became a way for salespeople to stock up on their own family and friends.

Last year, the biggest topic of conversation was that smog pollution has seriously affected the daily life of my early scum, and everyone is trying to reduce their pollution in different ways, and it is also common to prevent pollution by buying a house. As we all know, the 9th-11th floor is the first floor to buy a house, but because the 9th-11th floor isRaised ash layerThis assertion of science has caused panic in the hearts of the people. So what is a raised ash layer?

Is the 9th-11th floor a science of ash layer? There is only one truth, if you want to know what the truth is, let's follow our footsteps to find out.

The existence of the ash layer refers to: "Due to the influence of air flow and the building microenvironment, part of the dust density of the building within a certain height range is larger. But not necessarily the 9th or 11th floors of the upper floors, because "the exact height is affected by many factors, in different regions, in different cities and even in different communities, which are related to the density of dust, the height of surrounding buildings and the turbulence characteristics of the airflow."

This means that the "ash layer" of different buildings is not the same and cannot be generalized.

Is the 9th-11th floor a science of ash layer?

Someone said: "Layers 9 to 11 are favorites, they belong to the ash layer, and they can't be bought", is this statement correct? Relevant experts believe that this statement is obviously not based on science, "because the air is in constant flow, and the lower layer near the ground may gather some large particles that fall down, which has little impact on the human body."

Experts said that due to the air flow, the monitoring probe of general or PM10 is erected at a height of one or twenty meters, even if the floor is dozens of meters higher, the results are similar. Therefore, the assertion that floors 9-11 are ash layers is not scientific.

The above brings you what is the ash layer? Is the 9th-11th floor a rolling school in the town of Yangshen? All of it.

The ash layer refers to the high density of some dust in the building within a certain height range due to the influence of air flow and building microenvironment, and these layers are called ash layer.

The so-called "ash floor" is a rumor, especially the high-rise from the 18th floor to the top, and the 9th-11th floor is not high or low because it is in the middle, it is really a good floor, and the house price is relatively high. If the floor is too low, the view and lighting are not good, if it is too high, it is inconvenient to go up and down in case the elevator is broken, and some people have a feeling of dizziness when looking down from a high place, especially ladies and children.

Physics experts pointed out that the statement that about 10 layers are "ash layers" is inconsistent with the common sense of atmospheric physics. Because at a height of thirty or forty meters above the ground, the dust does not stop. Dust does not stop in the stratosphere of the atmosphere from 10 km to 52 km above the ground.

In other words, there is no so-called ash layer in ordinary high-rise buildings.

The ash layer is just a statement, not scientifically determined. In general, pollutants in the air continue to settle and flow with the airflow, and in the absence of pollution sources in the air, the higher the floor, the cleaner the air is. The so-called "dirty air pause" may refer to the phenomenon of "inversion layer".

In general, the higher the altitude of the atmosphere, the lower the temperature, and the air is prone to convection, which allows pollutants to disperse.

However, in autumn and winter and under special climatic conditions, the temperature may increase with the altitude, and the atmosphere will appear "inversion layer". The thickness of the inversion layer varies from tens of meters to hundreds of meters, like a thick quilt covering the city, hindering the dispersion of urban pollutants.

However, the height of the inversion layer is variable, and the distribution of pollutants under inversion conditions is also constantly changing, and does not stay fixed at one height. Therefore, it is not accurate to conclude the "ash layer" based on the layer height alone.

It is unscientific to say that the 9th to 11th floors of the building are raised ash floors. Large particulate matter in the atmosphere is usually concentrated closer to the ground; Only for small particulate matter, it is possible to have a maximum concentration zone at a certain height under the action of external forces. However, due to the large number of influencing factors, this maximum concentration zone does not necessarily exist around all buildings; Even if present, the height of the maximum concentration zone varies for different buildings and for different sizes of particles.

What's more, there is only a slight difference in particulate matter concentration between different altitudes.

Does the ash layer really exist? Can't buy it?

It is true that a small number of people believe in the 9-11 layers of the high-rise "ash layer", like.

Some people believe that "Jackie Chan" has the same surname as "Cheng". The so-called "ash layer", "floating dust layer" and "ash stagnation layer" are simply rumors, a complete rumor, rumors say that the 9-11 layer is the "ash layer", in fact, the Chinese love to spread falsehoods, see the wind is rain, this rumor originated from a sales lady in 03 years to write, it is simply a family's words, not only there is no scientific reason, there is no practical test, but also no professional test data basis, to put it bluntly, it is rumor. This rumor has been amplified by many people, many people don't know how to use their brains to think about it when they encounter problems, which has invisibly helped the spread of rumors, although the rumor of "raising ash layer" has long been cracked, but now there are still many people who believe it, hey......

A relative of mine is selling houses, one of his two houses is on the 9th floor, and the other is on the 10th floor, and he clearly told me that the so-called "ash layer" is purely a rumor, especially the 18th floor to the top of the high-rise, the 9-11th floor because it is in the middle, not high or low, it is really a good floor, and the house price is relatively high. If the floor is too low, the view and lighting are not good, and you think about all around you.

It is a forest of high-rise buildings, you buy a low-rise and it is boring, and the sound in the community can be heard, which is more chaotic and loses the meaning of buying high-rise; If it is too high, it is inconvenient to go up and down in case the elevator breaks, and some people feel dizzy when looking down from a high place, especially ladies and children. Some unscrupulous buyers use this rumor to mislead buyers, and these layers are kept by their own insiders, or else.

It's just to keep the price increase.

If you think about it, you know that dust has weight, and if it is only affected by gravity and air resistance, it will eventually fall to the ground, but because of the flow of air, dust is affected by gravity and wind.

It is also possible to float in the air, but the airflow generated by different regions, wind directions and different community layouts is different, and different air humidity and temperature also affect the concentration of dust.

Many families in China buy a house as a family and "go bankrupt", to say that caution is a must, but everything must be thought of, not listen to the wind or rain. This is also the case when I bought a house, for this so-called "ash layer", I ran more than a dozen communities, asked many people, including those who lived on these floors, and said that they did not feel the dust, at least it was no different from other floors. I also consulted a lot of information, and its ** 13 sets of news specifically asked experts to explain through experimental data that the ash layer is not credible at all, just rumors; Just like there are still people who believe in "fake eggs", it is really ridiculous, unless a seamless mold can be made, otherwise the eggshell can not be made, and it will come out early in time, so the cost of this so-called "fake egg" is too high, it is too expensive than a real egg, and is there a fake one?

Actually, no one has ever seen fake eggs, but they have only heard about it, because fake eggs do not exist ......Rumors stop at the wise.

Dust particles also have weight. If there are no other external forces, only gravity and air resistance, they will eventually fall to the ground. However, since there are air currents (i.e. wind) in the air all the time, dust is constantly affected by air currents as it falls.

Some small particles of dust are very likely to float in the air for a long time under the continuous action of gravity and wind. Even if one part of the dust falls smoothly, another part of the dust will start again, and the cycle of "dust and sedimentation" is constantly going on.

At the top of floors 9 to 11, these floors are gray floors, where the foul air comes to a standstill.

But physics experts point out that to say that about 10 layers is "gray" is inconsistent with atmospheric physics. "Because thirty or forty meters above the ground, the dust does not stop. "In the stratosphere, from 10 km to 52 km above the ground, the dust does not stop.

In other words, there are no ordinary high-rises. In fact, according to the survey, almost all residents who live on the 9th to 11th floors of high-rise buildings do not have a special feeling of "bad land".

The existence of the ash layer means that due to the influence of airflow and the building microenvironment, the dust density of the building is higher within a certain height. But not necessarily at the top of the 9th to 11th floors, because a particular height is affected by many factors, in different regions, different cities, different cities, and even different regions, the dust density and height are related to the turbulent nature of the surrounding air.

This means that the "gray layer" of different buildings is different and cannot be generalized. At the same time, there are too many scientific factors for people to understand.

Buying a house is a very important thing for ordinary families, and the choice of house makes many people very entangled. There are rumors on the Internet that the top ten floors of residential buildings are in the gray layer of the city, and these floors are seriously polluted, so it is best to choose carefully when buying a house, which makes many uninformed buyers believe it.

"There is a saying that the 9th and 11th floors of the building are ash floors, but this statement has been debunked, and there is no such thing as ash floors. The statement that the 9-11 layer is the ash layer originated in 2003 in an online article, in fact, this statement not only has no scientific reason, but also has no practical test, and there is no professional test data to rely on.

Don't listen to them fooling people, the 8th to 12th floors belong to the ash floor. If you don't mop the floor for two days, the ground is full of dust, and living in this kind of house is extremely easy to get lung disease.

Is it hard to buy an air quality monitor? On the 1st, 5th, and 10th floors, the stairways are tested according to different temperatures and weathers, and you just need to know what you know.

At all, Yang Chen has long refuted the rumors, it is the developer's routine.

No matter what you say, I won't buy these layers.

Hello, it is generally easy to get dust along the road, or the higher the multi-layer, the more dust, and the high-rise houses are generally concentrated in the 8-12 floors, which are most prone to dust.