Can you avoid foggy days by living in a tall building?

"Living in a tall building. Living in a high-rise building, the air is fresh and the body is away from smog! " —— Recently, it suddenly spread that high-rise office buildings or residential buildings can avoid the influence of smog. Is that really the case? Meteorologists and environmental experts say that in most cases, the higher you live, the better the air, but in some cases, you "vacuum" more. Want to live high and completely avoid smog? Sorry, the expert bluntly said, "There is no such tall building on earth!"

These days, in the circle of friends of Weibo and WeChat, it suddenly spread that the 9th floor to 1 1 floor of high-rise buildings are only dust floors, and the polluted air will stop when it reaches this height. The floors above 1 1 have the best air quality. This makes many people who live in high-rise buildings or work in high-rise office buildings suddenly have a little sense of superiority.

Jiang, deputy director and chief forecaster of Nanjing Meteorological Observatory, analyzed that in general weather, the higher the floor, the better the air quality. Because "the higher the altitude, the lower the concentration of pollutants in the air and the better the air quality". In contrast, the lower floor will be more affected by roadside dust and automobile exhaust, because the pollutants in the air near the ground are relatively concentrated.

The higher the air, the better. That's just theoretical. Occasionally there will be exceptions, such as when there is an inversion layer. Jiang told the Nanjing Morning Post that the higher the altitude of the atmosphere, the lower the temperature, and the air is prone to convection, which makes pollutants spread. However, in the morning or evening of autumn and winter, under certain conditions, the temperature may rise with the increase of height, resulting in "inversion".

According to monitoring, the thickness of inversion layer in Nanjing area can reach 150-300m, which makes more smoke and impurities gather near the ground and causes serious pollution. The height of 150m ~ 300m is exactly the height of a high-rise or super-high-rise building with 30 ~80 floors. In order to exceed this height and avoid air pollution caused by adverse weather, the 89-story Zifeng Building with a total height of 450 meters is probably the only choice for Nanjing.

As for not only wanting to breathe better air, but also getting rid of the smog completely, living in a tall building is definitely not a wise or realistic choice. Deputy Director Jiang cited the previous monitoring data: the vertical coverage height of major harmful pollutants such as aerosols in Nanjing smog is 2000 meters or 3000 meters from the ground to the air.

2000 meters to 3000 meters? At present, the tallest building in the world, the Khalifa Tower with 0/62 floor in Dubai/KLOC, UAE, is only 828 meters high!

Therefore, citizens, instead of thinking about "hiding in high-rise buildings and unifying", it is better to think about how to start from ourselves and reduce air pollution. As long as the air is good, no matter whether it is a high-rise building or a bungalow, there is no need for "self-improvement" and "smog" to work hard.