Is it true that there is a dust layer on the 10th floor of a high rise building?

Not necessarily. Because "its specific height is affected by many factors, in different regions, different cities, different urban areas and even different communities, which is related to the density of dust and the height of surrounding buildings.

It has to do with the turbulent characteristics of the airflow." This means that the "ash layer" of different buildings.

It's not the same, and it can't be generalized.

Introduction]: The so-called "ash layer", "floating dust layer" and "ash stagnation layer" are all rumors, a complete rumor, in fact, many people love to spread falsehoods, see the wind is rain, this rumor originated in 2003 in a "sales lady true confession.

Not only is there no scientific reason, there is no practical test, and there is no professional test data, which is a rumor to put it bluntly. 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.

Ins and outs]: This rumor circulated at least in 2003, originating from a forum post in which the poster claimed to be a real estate consultant and claimed to **sell shady properties, and as a result, this post was widely used** and evolved into multiple versions. For example:

China Economic Net:2003-11-26 07:51 Jiangxi**:

Don't believe me" Sales Xinhuanet.

2003-12-15 07:31 Real estate consultant broke the insider: the real estate market several posts said so:

Don't think that the ninth to eleventh floors in the upper floors are good, then you are very wrong, these floors happen to be the ash floor, and the dirty air will stop at this height, and we will not tell you. ”

Truth]: According to an online investigation, this rumor originated from an online article "Confession of a Sales Lady" in 2003. [1] This "Confession" makes the term "ash layer" another heavy stone on the hearts of home buyers.

But on the other hand, it can send the dust away and play a diluting role. Therefore, the influence of air flow on dust concentration is complex, and it is closely related to wind speed, wind direction, topography, etc. In a city with many high-rise buildings, many meteorological conditions such as wind speed, wind direction, and temperature are affected by buildings, and different building street layouts will produce a variety of different airflow patterns.

Therefore, the movement and concentration distribution of dust in the atmosphere will be complex and rapidly changing, and it is difficult to grasp its rules.

2011-06-09 11:25 The existence of the ash layer refers to: "Due to the influence of air flow and building microenvironment, part of the dust density of the building in a certain height range is larger.

But not necessarily the 9th or 11th floors of the high-rises, because "the specific height is affected by many factors, and varies in different regions, different cities, different urban areas and even 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.

If you have to"Raised ash layer"Find a basis, probably due to"The canyon effect"impact. An expert in architectural design in Chengdu said that the "canyon effect" refers to the surrounding bus arteries, factories and high-rise residential buildings, under the action of the wind, the air flow containing dust does not move smoothly, but "hovers" up and down 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.

But it doesn't have to be the 9th to 11th floors of the upper floors, because the height of this section is affected by many factors, and it varies in different regions, different cities, different urban areas and even different communities, which are related to the dust density, the height of the surrounding buildings and the turbulent characteristics of the airflow. "The "ash layer" of different buildings is not the same and cannot be generalized.

Abstract According to relevant experts, the so-called ash layer is not in line with physical common sense, the dust does not stop at a position of thirty or forty meters from the ground (9-12 layers), it will not stop even if it is between 10 kilometers and 52 kilometers from the ground, so there is actually no statement of ash layer.

Is the upper 10 and 12 floors ash layer?

Hello, I am helping you to inquire about the relevant information and will reply to you immediately.

No, it's a rumor, so to speak.

According to relevant experts, the so-called ash layer is not in line with physical common sense, dust does not stop at a position of thirty or forty meters from the ground (9-12 layers), it will not stop even if it is between 10 kilometers and 52 kilometers from the ground, so there is actually no statement of ash layer.

Is the 12th floor of the high-rise suitable for living?

Is the upper 10 and 12 floors ash layer?

Hello, I have seen your question and am sorting out the answer, please wait for a while It is generally believed that the high-rise residential building is below 30 meters below the ash floor, that is, between 8 and 12 floors. Generally, it is not recommended to choose 8 12 floors (poplar ash layer), nor 1 2 floors (bad lighting, high heavy metal content). Of course, this value is general, and the specific area, building, environment, and location are different.

Changsha City, is there any solution to the 12-layer poplar ash layer?

Now that you've bought or lived in it, don't think about it so much. Atmospheric control is not something that can be solved by one person. After all, the air is circulating, the same community, the same piece of air, the air is good, everyone is good, the air is not good, it is estimated that no one can run, after all, none of us can go up to the nine heavens.