Hand-Carved Salt Lamp with 110V Light Fixture Bulb and UL-Listed Switch Negative Ion Generator Himalayan Rock Salt emits negative ions to clean the air and refresh the body. Disclaimer: The FDA has not evaluated these statements. These items are not intended to be used to diagnose treat cure or prevent any disease. There is no proof that Himalayan salt lamps emit negative ions or purify the air. A commercial ionization machine capable of producing high-density ionization is the best way to add negative ions to your home.