Does the electronic pollution run to the low place, the high floor is small, and the pollution is sm

Do you live upstairs forever, that's the immortals.

In modern society, the residential buildings of high-rise buildings make people have a feeling of "seeing all the buildings at a glance", with a wider view of the high-rise, better air quality and less noise; The natural wind is strong, the lighting is good, and the sunshine hours are long, and some of them shine towards the sun for seven or eight hours. So, is the higher the better? Some people think that the high-rise air is fresh, the noise is less, and the scenery is also very beautiful, and the premise is what kind of environment is around the small high-rise where you live, there are no mountains and rivers around the high-rise where you live, and what you see is only the "back of the head" of the front building, and "enjoying" all kinds of photoelectric pollution in the city can be said to be a good view.

In fact, many people who live in high-rise buildings want to view the scenery themselves, but they have become a "landscape", so that the residents of the same floor opposite can see their small homes transparently, I really don't know where this "landscape" can make the heart beautiful, and the low floors have a good privacy due to the blind corner of the line of sight and the obstruction of trees and low buildings on the ground (which must surprise everyone, but it is so).

In addition, the air on the upper floors is not as fresh as imagined, and chimneys of all sizes almost surround the city, and harmful substances will inevitably accumulate above 30 meters. 8 11 floors are the so-called ash layer in environmental science, dust and harmful substances in the air have a process of staying at this height due to the influence of the "canyon effect", and there is a "high-density area of pollutants" in the middle of high-rise residential buildings in many dense residential areas. To put it bluntly, the dust will linger between the 8th and 12th floors of these buildings, take a break, and then slowly "return to the roots", in the process, the occupants will "breathe and share the same fate" with the dust for a period of time before "kissing goodbye".

The so-called "canyon effect" refers to the surrounding public transport arteries or factories, as well as high-rise residential buildings. Under the action of the street wind, the air flow containing dust does not move smoothly, but "hovers" up and down in a certain area between the tall buildings. Pollutants near the ground rise to a certain height with the air flow and then dissipate downward or horizontally.

This "height" is about 30 meters. That is, between 8-12 floors.

The higher the floor, the more dusty it is.

Air pollutants mainly include suspended particulate matter and other gaseous pollutants. Suspended particulate matter mainly includes coal ash, sand, ash, etc., under the action of air flow, these suspended particles will be suspended in the air, but because of gravity, they will eventually fall back to the ground, and will not be rashly displaced to an altitude of 30 meters. Therefore, the density of suspended particulate matter decreases with increasing height.

In other words, the higher the floor, the less dust.

Other gaseous pollutants are mainly in factories, automobile exhaust emissions, etc., these polluting gases are often just discharged, the highest concentration, with the diffusion of air flow more and more thinner, if the polluting gas ** in the car, automobile exhaust emissions are generally on the ground, so that the pollution of the residential near the ground is much greater than that of the high-rise.

If the polluting gas is in the factory, the factory will generally emit gas from the high altitude, and the air pollution of the upper floor is more serious, with the diffusion of the air flow, when it drops to the lower floor, the density is not so large, and the high-rise pollution is higher than the lower floor.

Therefore, it is not that the higher the floor, the greater the dust, when buying a house, try to choose a building around the river and by water, because water has a better purification effect on the air, and generally the dust of the building by water is relatively less, and the air quality is relatively high-quality.

No, generally speaking, the higher the floor above the ground, the cleaner the air.

Gaseous pollutants such as sulphur dioxide, nitrogen oxides, carbon monoxide, and particulate pollutants such as PM10, as well known as PM10, decrease with floor height. If the residence is close to shopping malls, downtown areas, roadside barbecues, restaurants, etc., relatively speaking, the air quality is relatively good if you live on the upper floors.

I believe some people have heard it when buying a house"Layers 9-11 are ash layers"This statement does have some people who believe it"Layers 9-11 are ash layers", as if someone firmly believed"Jackie Chan"Last name"into"Same (.)"Jackie Chan"It's a stage name, and its real name should be"Chen Gangsheng, Fang Shilong")。

The so-called"Raised ash layer""Floating dust layer""Gray stagnation layer"These are all rumors, a complete rumor, in fact, many people love to spread falsehoods, see the wind is rain, this rumor originated in 2003 a "sales lady true confession" of the online article, is simply a family's words, not only no scientific reason, no practical test, but also no professional test data basis, to put it bluntly, it is rumor.

People with brains search on the web"Raised ash layer", you 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 also many remarks that do not know how to follow the rumor.

According to the test results of the laboratory staff of the Environmental Protection Agency, it is not the dust concentration on the 9-11 floors that is the highest, but the real result is that the concentration and PM10 concentration basically decrease with the increase of height, and the highest value is not measured on the 9-11 floors, so the dust concentration on the 9-11 floors is not the highest.

The experimenter used a hand-held air measuring instrument to take five air samples at each layer, and then measured the concentration of PM10 separately. The measured data on the first floor is 18, and PM10 is 40; 15 to the 9th floor, 30 PM10; When I got to the top 25th floor, it was 13, which is 5 less than 18 on the first floor. Through such a comparison, the dust concentration on the 25th floor is the lowest, and the 9th-11th floor is also in the middle of the measured values.

The experimenters conducted another test in two other high-rise buildings, and the concentration measurements obtained on each floor did not differ much, so the statement that "floors 9-11 are ash floors" is not valid.

The test results also show that the higher the floor, the better the air, but factors such as the surrounding environment can also have a great impact on the values. Because the particles are very small, the flow of air through the air will mix very evenly, and there will not be much difference between living on the 10th or 20th floors as the height increases. At the same time, it is also directly related to meteorological conditions and surface conditions, such as wind, rain, air pressure and temperature will also directly affect the quality of air quality.

The floating dust layer is generally 30-40 meters from the ground, and the building height of the building is 3 meters, which should be between 9-12 floors.

The floating dust layer refers to the level where the floating dust in the air is located, that is, the floating dust layer of the air, which is the dividing line for the less floating and subsidence, that is, the air above the floating and sinking layer will be better.

I feel that the height of the middle floor should be the cleanest, the low floor is the easiest to attract dust, due to the effect of the wind, the upper floor is also easy to attract dust, and the middle floor is the best!

No, there is no scientific basis for this. It still depends on the surrounding environment where you live.

To be specific, what does it mean is not necessarily, it is related to the wind direction, and I personally understand that the lower it is, the more dust, after all, the low-altitude pollution is serious, and it is closer to the range of human activities......

This is not necessarily, first look at the air environment of the place where your building is built.

There is no such statement.

The air quality is better with higher floors.

It seems that yes.

The dust is going up.

It does not matter.

As a major cause of haze weather, WHO has pointed out that the risk of death increases by about 15% at annual average concentrations of 35 micrograms per cubic metre compared with 10 micrograms per cubic metre. Studies have also shown that higher concentrations are associated with higher rates of respiratory and cardiovascular diseases.

The harm to the human body is so serious, but most people are kept in the dark and do not get the corresponding tips and guidance to take effective precautions to avoid this harm, this reality is obviously contrary to the duty of public service and the spirit of information disclosure.

According to the new air quality standard of the detection network, the distribution of the 24-hour average standard values is as follows:

24-hour average standard value of air quality grade.

Excellent: 0 35 gm

Good: 35-75 gm

Light contamination: 75 115 g m

Moderate pollution: 115 150 g m

Heavy contamination: 150 250 g m

Severe pollution greater than: 250 g m and above.

It has nothing to do with the floor height.

The outdoor air quality of an average residential building hardly changes depending on the height. He told reporters that in Beijing, air pollution will intensify when there are unfavorable diffusion conditions of temperature inversion, because the pollutants emitted by the entire city are "suffocated" by the mixed layer of the inversion atmosphere like a "pot lid". The biggest feature is that the particles are small and the transmission distance is long, so they will not be easily deposited on the ground.

The higher the floor, the lower the concentration, which has been proven to be a rumor.

Because the maximum height at which the pollutants discharged from the ground are mixed in the vertical height is called the "boundary layer", there is no so-called ash layer, and the height of the 9th to 11th floors is up to 40 meters, and the concentration of pollutants will not be very different from the surface of the boundary layer, and it will not be very different from the 20th layer.

Similarly, the claim that "if you close the doors and windows, you won't be harmed by smog" is also unscientific, and particulate matter with a diameter of microns can be transmitted to the house through air movement at any time, and may also be carried into the house with human activities. When the smog is severe, the air in the house is also polluted.

Therefore, it is impossible to avoid the smog by selecting the top level mentioned above. It is still necessary to adopt positive and correct means to prevent and control smog. Close doors and windows, turn on the air purifier or fresh air system, at least to ensure that the air in the office environment and living environment is harmless.

In terms of our physical attempts, the concentration decreases as the floor increases. Because as a particulate matter there is mass. Under the action of gravity, it must move towards the ground. As a result, the concentration decreases as the floor increases.

However, because the particles are very fine and have a small mass, they can be suspended in the air for a long time under the action of air flow and air friction. Therefore, although the concentration will decrease as the floor increases, it will have a higher levitation capacity, so it is necessary to have a large floor span to perceive the change.

Negative ion air purifier and fresh air system can produce negative ions equivalent to nature, truly restore the balance of positive and negative ions in nature, not only can effectively remove the air and other tiny particles, but also can supplement the human body needs every day equivalent to the natural negative ions, create a healthy and comfortable working and living environment, at the same time, improve the body's self-healing ability and immunity, to achieve the purpose of prevention and disease, and the emission distance is long, the particle size is small, and the voltage is low (about 300V, It will not produce ozone, nitrogen, oxygen, etc.), it is a truly effective negative ion, and the safe negative ion does not have any *** on the human body.

Dust moves vertically with the atmosphere, and after rising to a certain height, there will indeed be a decrease in vertical motion and an increase in horizontal motion, and if there are no other factors, there may be relatively more dust at this height. However, the height at which it rises will mainly become a horizontal movement, which is closely related to the small environment in which it is located. Factors influencing this altitude include sunlight, the relationship between the local building and the wind field (upwind, downwind), the stability of the atmosphere as a whole, and the specific meteorological conditions at the time.

In some places, there may even be more horizontal movement below a few meters, while others may reach a height of several hundred meters or even higher, and the difference is very large. Moreover, this height can vary greatly from place to place at different times.

The pattern of polluted air masses is that it may float lower at night, and on clear days, it may float a little higher into the sky because of sufficient dispersion. During the period of severe pollution, the spatial and temporal distribution of air pollution is basically evenly distributed.

pm2.5. Pollution is mixed evenly below 80 meters (25 floors) at night and 350 meters (120 floors) during the day, that is, during the pollution period, almost all high-rise buildings are in the polluted air mass. The concentration and PM10 concentration are the highest in the 1-3rd floor, and then they begin to decline and show a uniform distribution.

Suffice it to say, the first to third floors of the building are the areas with the highest concentration, i.e. the dirtiest below 10 meters. Haze day travel Guardsin imported from the United States of America Cat has!

When buying a house, everyone knows that the higher the floor, the more expensive, but in fact, the higher the house, the better, it should be based on your own family situation, different from person to person, suitable is the best. The main factors to be considered in the floor analysis are: family structure, noise, ventilation and lighting, haze particles, etc.

Middle-aged and elderly families and families with children can choose lower floors, which are convenient to enter and exit, and the houses are relatively cheap; The disadvantages are low-level noise and air pollution. Families of all ages can choose the middle floor, which can not only have better ventilation and lighting conditions, but also have a more down-to-earth living feeling. The disadvantage is that high-rise buildings on the side of the road tend to form echo walls, so sometimes they are noisier in high-rise rooms.

Young families generally choose higher floors, which have good views, good ventilation and lighting, and good privacy. The disadvantage is that when buying a house, you must confirm with the developer the brand of the elevator equipped in the house, and understand whether the elevator has a backup power supply. If there is no backup power supply, it will be inconvenient in the event of a power outage.