Air purifiers help make the air around you clean. There is one type of air purifiers which use UV light as UV light is proven to be a potent killer of airborne bacteria. In small amounts, as the ones used in a ultraviolet air purifier, it is not enough to be harmful to humans. I have one liquid based air purifier in my home living room where it helps to give a pleasant scent to the room as well as clean the air. It’s not as advanced as a UV air purifier. Ultraviolet Air Filtration Systems the ones to be considered for best performance.