This explanation has the great benefit of sounding scientific. Who really knows how ions are formed in the first place or what will happen to blocks of heated salt rock, anyway? One person with pretty deep knowledge on the topic is Caltech professor of chemistry Jack Beauchamp, an expert in (among other things) the myriad processes that generate ions and the analytical methods used to detect those ions.
The strongest evidence supporting any benefit of negative ions is as an antibacterial agent. A 1979 study in the journal Nature showed that high levels of negative oxygen ions could kill bacteria. Ionizers could also reduce the prevalence of surface and airborne bacteria in refrigerators, according to a 2009 study. However, that research applied only to sanitizing food or work surfaces, and did not make any claims about health benefits.

The most talked about Himalayan salt lamp benefits is to do with personal health. Being natural and absolutely no chemical and helps the bodies condition. Mixing Himalayan Salt crystal with water is known as Sole’ which had been known in the olden days at the life’s soup. The reaction combining the salt and water is called brine. This aids in balancing the positive and negative ions of the water. This combination hydrolizes the molecules in the brine therefore makes a noticeable vibration in the body. This solution when taken is specially effective when a person is sick. Taking one teaspoon of the solution (250ml water) on an empty stomach each morning is advisable. This solutions helps in detoxifying the body of impurities. This solution is also great as the mineral content is easily absorbed in the skin.
This brings me to my next point. Atoms and molecules are less reactive when their valence electrons are organized in pairs. If they have an odd number of valence electrons, or if they have a few that are not paired together then they are called “free radicals” (Wikipedia). This does not mean that free radicals are only cations (positive ions). They can be cations, anions, or neutral. For example, neutral sodium atoms have one unpaired electron which can participate in chemical reactions with other elements, and Methylene (CH2), has two unpaired electrons on the central carbon atom. Free radicals are also not all bad. Wikipedia also states that free radicals play a key role in biology where they help to regulate the body. Usually when people talk about harmful free radicals they are referring to oxidants which loosely speaking are molecules which take away electrons from cell membranes, proteins, and DNA (cancer-causing mutations) in the human body. This is probably where the idea of free radicals being positive ions comes from because they like to steal electrons.
The other claim, discussed in more detail below, has to do with a study published on the effects of ionization in neural structures and blood flow in laboratory rats. In a similar issue of blindly comparing different scales, these rats (which are both not human and much smaller than humans) were directly fed negatively ionized air at high concentrations that would be inconceivable for a block of salt to produce, even if it did produce some small amount of ions.
To accent the natural beauty of the salt crystals, they’ve housed them in a decorative metal vase, perfect for the design-conscious home. Illuminate your room with a warm, pleasant and relaxing amber glow. It's a perfect choice in the center of a coffee table, desk. Great for meditation, yoga spaces, and as a nightlight. Also, you can try it as a bedside lamp.
It’s true! They’re called salt lamps or salt rock lamps, and yes, they’re actually made from pink Himalayan salt and are able to light your surroundings — but they’re really not bought for their moderate lighting abilities. There are major claims that a Himalayan salt lamp does much more than provide you with a pretty glow. Himalayan salt lamp benefits supposedly include decreasing air pollution, negative ions and electrosmog caused by electronic devices in addition to symptom reduction for people suffering from from asthma, allergies and other illnesses.
Thanks for sharing your knowledge with us. I have Himalayan salt lamps in my house. I personally love them. These lamps are just more than awesome. They are not only beautiful but also have healthy and healing benefits for human mind and body as you have mentioned above. They eliminate all the dust particles and smoke from the air and make it pure and fresh. They help me in relieving stress and depression and improve the sleep cycle. I bought my lamps from ittefaqco at a very reasonable price and they are of great quality. You can visit their website if you want to.
Also, your citation of an EPA website is useless. It just links to the EPA’s IAQ site, which isn’t helpful in trying to figure out what you actually were using from the site. I don’t think I’d use WebMD as a source either if you want to appear reputable to the more intelligent people who can spot bullshit. (Not say WebMD doesn’t have valuable info. Kinda like Wikipedia, a lot is useful and valid, but I would never use it as a source.) 
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