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.
DIY Air Purifier for about $30 Bucks! I was skeptical, but after watching the video from University of Michigan Health System’s Sinus Center, I was convinced! I went out and bought 2 filters. They were not the Merv 13 but they were close 80 ~ 85% with Microban. I have had them running for about an hour and my sinuses feel soo much better!
Air Purifier Mimics the Benefits of Fresh Forest Air Inside the Home