Lower levels of residential fog and haze pollution is more serious?

Beijing haze is very serious, when buying a house had to consider the relationship between the floor and the haze, a lot of people say that the lower layer of the fog and haze pollution is more serious, is it true? Shanghai Jiaotong University using unmanned aerial vehicles equipped with portable testing equipment, air pollution monitoring experiment found, generally PM2.5 concentration with the change of the height of the generally show a vertical distribution rule, the to PM2.5 concentration is lower.
But experts also pointed out that if the existence of inversion layer, this pattern will be broken. The inversion layer is formed in more than two seasons, in 300 meters to 500 meters high. The mixing height of PM2.5 is at least 350 meters.
So the occurrence of temperature inversion, the vertical atmospheric turbulence is inhibited, the large amounts of dust and water vapor will be gathered in the below the inversion layer and 350 m below the gas pollution is most serious. (like a lid to cover the pollutants, leading to the spread of pollutants is difficult to spread. Shanghai's recent haze is mostly caused by the inversion layer).
So, do not live more healthy. According to the calculation of a universal standard of floor, floor is generally high in 30-40 meters, 350 meters is almost 120 floor height, that is to say, contaminating period, the only world financial center, Shanghai Center, Jinmao Tower such skyscrapers to avoid high pollution areas.
Which layer to buy the most appropriate?
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Several of the above theories seem to be rational, then what is the low layer of heavy fog or heavy fog in the 30 floor?
First look at the polluted air masses the haunt of the law: the position of the night it floats likely will be lower, sunny day, because the diffusion of adequate, it may float to a slightly higher point in the sky. The time and space distribution of PM2.5 is basically uniform distribution during the period of severe pollution.
A lightweight PM2.5 does not follow the laws of gravity sedimentation, but floating in the air in the average distribution, especially in the inversion layer.
So the outdoor, so indoor, studies have shown that in the closed case, particulate matter into the interior will by Brownian diffusion, gravitational settling and inertial impact effects, they will be reduced in a certain extent, the concentration of suspended particulate matter, including PM2.5.
The whole process, indoor and outdoor wind speed, humidity and so on will cause the impact, in the absence of indoor pollution sources, indoor air quality is relatively good. Daily variation of indoor concentration of 75% depends on the diurnal variation of outdoor concentration. That is, most people's intuitive experience, indoor and outdoor equivalent height of the value is lower than about 100 - 50.
One to three layers for the highest concentration of suspended particulate matter, that is, 10 meters below the most dirty. To although the value will fall, but in the inversion layer, each floor both PM2.5 and PM10, almost all, showed uniform distribution.
Therefore, buy a house do not look at the floor, the serious air pollution, live in 1 buildings and 30 buildings are in the fog and haze, the home installation of fresh air system is a must. , of course, under normal circumstances, it is best not to choice of street, road near the house, because it is affected by vehicle exhaust and dust.
But if you happen to buy a low level of residential, then it is necessary to do a good job closing the doors and windows, the new air system, of course, there is No.
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