Mango Leaves are part of the Hindu Tradition. They are placed to represents kama or fertility God. Mango Leaves are used to decorate the door of the House, Offices, Commercial Places, Temples or areas where rituals are being performed. It may just be a ritual but there is a more scientific meaning behind the hanging of these leaves (putting in kalash having different reasons) It absorb carbon dioxide and release oxygen, this helps in keeping the surrounding atmosphere clean and hygienic. People who have extremely stressful life style find it releasing to spend time in nature. So, it can be a small way of releasing and unwinding from stress.