For centuries people know about ability of Salt Crystal Rock to improve air qualities by enriching air with " Negative Ions " and ionized air beneficial to humans. Salt Crystal Rock and lamps made from Salt Crystal Rocks are natural air ionizers. Negative Ions produced by Salt Crystal Lamps effectively, and naturally improve the quality of the air by producing negative ions - the "Vitamins Of The Air". Negative ions can be found in nature, concentrated in air by the billions; on Mountain Tops after Thunder Storms, near water falls, forests, and by the Sea. Negative Ions give the air its invigorating freshness, airborne bacteria free, clean which is so beneficial for humans.