/kloc-how many floors is the best for a house with 0/7 floors?

1, from the first floor to the third floor, most people live under the canopy, close to the ground, and often hear the sound of branches knocking on the window.

2. However, living close to the ground also has disadvantages: most people think that living in the small high-rise on the third floor 17 is the most ideal, and it is precisely here that a lot of harmful substances are gathered.

There are less harmful substances on the fourth and fifth floors, because they begin to sink or dissipate horizontally.

4. The ideal house should be close to the ground and nature. 17 floor, small high-rise, it is best to live on the sixth and seventh floors. ?