A series of scientific studies show that salt crystal lamps / tealights can increase the negative ion count by up to 300%. Generally, a negative ion is an electronically charged molecule made up of oxygen. In fresh country air we find up to 4000 negative ions per cubic centimeter, however the number of negative ions in major capital cities at rush hour does not even reach 100. The impact of negative ion is powerful. Originally, it was found to speed recovery in burn or asthma patients, but was later discovered to affect serotonin levels in the bloodstream, stabilize alpha rhythms and to positively impact our reactions to sensory stimuli.