Your search for the best small portable air purifier for home ends at Daikin. Make your indoor air clean and fresh with Daikin indoor air purifier that features true electrostatic HEPA filter. Do you know that the air inside our homes can be two to five times more polluted than the air outside? In fact, 13 out of the 20 most polluted cities are in India. In recent times, the PM 2.5 (Particular Matter) has reached extremely dangerous levels.