Indoor plants are a very good source of purifying the air. They take in carbon di-oxide from the atmosphere and release oxygen indoors. Apart from releasing the oxygen the plants also absorb harmful chemicals that are present in our homes and offices. 

Having regular 'havans' or even burning incense sticks are great ways to remove negativities and impurities from the house. In fact they are great remedies to keep insects away from the house.

Cow's ghee is also put in the 'havans' and they say that the effect of the smoke from it is effective for eight kilometers all round.

Vinegar kept in bowls around the house absorbs smells, leaving the house odour free.