The air is vital for our survival. Our sense of sound, touch and feel are related to air. The air on earth is a mixture of various gases like nitrogen, oxygen, helium, hydrogen etc.
Oxygen is vital for human beings and nitrogen is essential for the growth of plant life which in turn provides oxygen.
Correct percentage of different gases, atmospheric pressure and humidity level is important for life forms on earth. Vastu recommends proper placement of doors, windows, ventilators, balconies, height of structure and placement of trees and plants for balancing the air element within the structure.