1, light
From the light point of view, the floor should not be too low, and the sunlight of the low-rise unit will be blocked by the surrounding buildings. But the floor is too high and the angle is wrong, which will also affect the sunlight.
2. Noise
There are many noise sources in the city. Noise will affect people's health, make people eat badly, can't sleep, and reduce learning efficiency. Low floor absorption ratio means more noise. However, if there are trees, sound insulation boards and other objects that can absorb sound waves around the low-level units, the effect will be better. The sound will rise, even to the upper unit. Generally speaking, the unit noise above 20 floors has little effect.