Salt lamps are prized for their negative ion production. ...beeswax candles, another natural air purifier. Pollen, dust, dirt, pollutants, and allergens in the air all carry a positive charge, and that is how they can be suspended in the air. The negative ions neutralize these positive ions so they can no longer be airborne.
Aro – Air Purifier by Giuk Choi - Aro features mood lights and aroma dispensing based on the moods of the people in the room. To achieve this, it incorporates voice recognition system that senses the mood and tone of the voice of the people. | Yanko Design
Infiland Ultrasonic Humidifier Air Purifier Aroma Diffuser, Mini Electric Aromatherapy Essential oil Diffuser Whisper-Quiet Cool Mist Humidifier Auto Shut Off---Light Brown Infiland http://www.amazon.com/dp/B00XMLLIBO/ref=cm_sw_r_pi_dp_p6bPvb1DTAX8G