Over the course of human history, the human body has adapted to the natural environment by responding to subtle changes in air parameters. The air we breathe has a certain chemical and ionic composition that is composed of gases like oxygen, hydrogen, and nitrogen — with their ions present in certain ratios. Ions are particles that make up gases, which have gained or lost one electron. An ion that is missing an electron is called a positive ion and an ion that has gained an electron is called a negative ion.
Increased Air Quality Improves the Quality of Life
With the advance of air conditioning systems, optimal air parameters such as air temperature and humidity were determined for user comfort. Unfortunately, air conditioning systems act like de-ionizers and in a sealed environment they generate ion-free air. In parallel to the development of air conditioning systems, because of the de-ionization problem, research took place in order to define the influence of the effect of the complete absence of positive and negative ions on human health and comfort.
The investigation revealed disproportionally high impact on human health. De-ionized air was found to cause headaches, drowsiness, irritancy, and rapid fatigue.
Reference: Is Atmospheric Superoxide Vitally Necessary? Accelerated Death of Animals in a Quasi-Neutral Electric Atmosphere, by Naum Goldstein and Tatyana V. Arshavskaya