Man cannot survive without air to breathe for more than a few minutes at best. The atmospheric air has a high content of oxygen which sustains all terrestrial life by being absorbed during respiration and forms most of the mass of the living beings. The oxygen so consumed is continuously replenished by living organisms through the process of photosynthesis wherein they use solar energy to produce elemental oxygen from water, which again is a compound with oxygen as one of its two elements. This replenishment process defaults when there is a lack of greenery from deforestation or drought. This, coupled with increase of smog that corrupts the atmosphere with toxic pollutants, creates a very unhealthy environment that renders all living things prone to diseases. The number of airborne epidemics is also on the rise. Therefore living in a pollution free environment where we can breathe fresh clean air is a primary safeguard for good health. Aerobic and breathing exercises naturally help strengthen a person’s constitution. Practising Pranayama, the ancient Indian yogic discipline, in particular is a highly effective means to good health.