Set of 2 Red Himalayan Crystal Salt Lamps with Dimmer Cord (7-8 Inches Tall) Scientifically proven to work like an air purifier by emitting negative ions The negative ions bind with positive free radicals and cancel them out Natural aid for Asthma, Allergens, Dander, Pollens and air pollutants When indoor air is full of free radicals this often results in us feeling sluggish Pure Himalayan Salt Lamp removes these toxins.