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In Europe, living above the sixth floor is considered harmful to health; In the United States, the price of high-rise houses is half cheaper than that of low-rise houses; In Russia, the first floor fell out of favor ... in fact, each floor has its own microclimate. Different floors have different effects on our lives. A few days ago, an article was published in the Russian journal Science and Life, which discussed the reasonable living height of human beings. From the first floor to the third floor, people usually live under the canopy, close to the ground, and often hear the sound of branches knocking on the window-this is the most comfortable place psychologically: keep in touch with the outside world and don't look down on people. However, life close to the ground also has shortcomings: air circulation slows down, air exchange is blocked, shadows and humidity increase, and pollution is more serious. Because cars and asphalt roads make the air full of formaldehyde, carbon monoxide and nitrogen ... it is safe to keep a distance of at least 200 meters from the main road where cars drive. Generally speaking, the third floor is the most ideal, and it is here that a large number of harmful substances are gathered. There are much less harmful substances on the fifth floor, because they begin to sink or dissipate horizontally. So, is the higher the better? The high-rise air is fresh, the noise is low and the scenery is beautiful. However, urban construction ecologists believe that residential floors should not exceed six floors. Because the high-rise air is not as fresh as expected, large and small chimneys almost surround the city, and it is inevitable that harmful substances will gather more than 30 meters. Psychologists and ecologists believe that children should not live on floors above the sixth floor if they want to grow up healthily. The environment outside the window is very important. Being high above the brick wall all day will make children unconsciously hostile to themselves and the world. The standard of an ideal house is: the house is no more than six stories, with beautiful natural scenery, a park on one side and beautiful water on the other. Trees and water are excellent filters to stop dust. Another invisible enemy of high-rise residents is electromagnetic radiation. The reinforced concrete structure forces the electric waves emitted by electrical equipment to circulate along the house, and a considerable part of them reach the top floor. So high-rise residents often have headaches or are in a bad mood. People who live on the first floor are often disturbed by noise. In fact, living on the twentieth floor is hard to avoid noise. Sound usually travels in the shortest route, but sometimes high-level people can hear the noise on the main bus lines. It turns out that the route of sound waves is related to the number of trees and buildings. Sometimes the sound can't reach the high-rise window, so it goes up freely. This factor can't be ignored when choosing a house.