When buying a house, which layer is the ash layer?

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 to 11th floors of the upper floors, because "the exact height is affected by many factors, in different regions, in different cities, in different urban areas 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. At the same time, because there are too many scientific factors to be integrated, ordinary people can't figure it out. 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.

See Encyclopedia --- Raising Ash Layer.

Buying a house is careful! Is it true that the 9th to 11th floors are the ash layer and you will get sick after living in it? Listen to what Ah Yue said, Ah Yue Kanfang focuses on high-quality short creation in the real estate field to help you answer difficult questions about buying and selling houses.

I believe that some people have heard the saying "9-11 floors are ash layers" when buying a house, and some people do believe that "9-11 floors are ash layers", just like some people firmly believe that "Jackie Chan" is surnamed "Cheng" ("Jackie Chan" is a stage name, and his real name should be "Chen Gangsheng, Fang Shilong"). The so-called "ash layer", "floating dust layer" and "ash stagnation layer" are all just rumors, an outright rumor, in fact, many people love to spread falsehoods, and seeing the wind is rain.

This rumor originated from a 2003 online article "Confessions of a Sales Lady", which is simply the words of a family, not only has no scientific reason, but also has no practical test, and there is no professional test data to rely on, to put it bluntly, it is a rumor. When people with brains search for "ash layer" on the Internet, they will find that there is no authoritative source for this word at all, but there are many remarks to clarify this rumor, and there are many remarks that do not know how to follow the rumor.

Revealed: It turned out to be a sale**! How many good houses have you missed because of this misunderstanding?

What are the floors of the high-rise building?

The meaning of the ash layer is that in the atmosphere, when the dust rises to a certain height, it cannot be raised again due to its own weight and air current. They will be concentrated in a certain section of height, and the air in this circle will be particularly bad. This is the raised ash layer.

The popular ash layer refers to the ninth to eleventh floors of high-rise buildings, and it is said that the height of the ash layer is the location of these three floors. Since the introduction of this statement, sales of the ninth to eleventh floors of high-rise buildings have plummeted, and people who know about them are reluctant to buy these floors. People are worried that the air quality is too poor, which will cause harm to their health and the health of their families.

But is it true that the ash layer is raised? Is there really such a layer of air in the atmosphere, which is called floating dust?

Is it true that high-rise buildings raise ash floors?

The term "ash layer" began in 2003 and became more and more popular after the real estate boom in 2008, almost to the point that everyone in the streets and alleys had heard of it. Probably because there are too many people preaching, everyone thinks that it is undoubted. But in fact, the more stupid the ash layer does not exist.

Yes, there is no such layer of air as the ash layer in the air, and the dust floats in the air, and will move erratically with various air currents and external environmental influences, and will not stay in a certain position at all. Many professionals and scholars have used scientific theories and experimental structures to prove that there is no ash layer.

Raising the gray layer to refute rumors

The so-called "ash floor" is purely a rumor, especially the high-rise from the 18th floor to the top, and the 9th-11th floors are not high or low because they are in the middle, which is really a good floor, and the house price is relatively high. If the floor is too low, the vision and lighting are not good, you think about the high-rise buildings around you, 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 a 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, these layers of their own insiders to stay, or keep the price increase, and through these so-called "ash layer" and "noise layer" and so on to reduce the range of home buyers' choices, so as to buy as soon as possible.

Hello dear. The ash layer is generally 8 to 11 layers in the cherry blossom shooting. The dust layer of Ash Royal Song is generally 8 to 11 layers.

Floors 8 to 11 are the so-called ash layer in environmental science, and the dust and harmful substances in the air have a process of staying at this height, in fact, due to the influence of the canyon effect, under the action of street wind, the air flow containing dust does not move smoothly, but hovers up and down in a certain interval between high-rise buildings. Pollutants near the ground rise to a certain height with the airflow and then dissipate downward or horizontally. This height is about 30 meters.

That's between the 8th and 11th floors. And it happens to be a noisy space, and many consumers think that they can get away from the hustle and bustle of a high-rise building, but who would have thought that actually listening to the noise of vehicles on the first floor is better than listening to it on the 8th to 14th floor. The air quality of high-rise buildings is higher than the floor, the better the air quality, in fact, it is not anywhere, and the air quality of all high-rise buildings is accompanied by the increase of floors and the distribution of the situation is calm, which is the so-called canyon effect.

The normal airflow, because it is blocked by the floor, there is a whirlwind, so that the instability of dust appears. For example, high-rise buildings are generally 9 to 11 floors, but the height of about 30 meters will cause such problems.