A negative air ion is an atom or molecule in the air that has gained an electron, while a positive ion has lost an electron. Both positive and negative ions occur naturally in the air. However, negative ions are more concentrated in fresh air. Negative air ions can be produced by lightning, ocean surf and waterfalls. There are also electrical devices called 'air ionizers' that produce negative air ions. Such air ionizers have been used in the treatment of seasonal winter depression.
Levels of a chemical messenger in the brain called serotonin decrease in autumn and winter. This decrease may be related to the depression that some people experience in the winter months. It has been proposed that negative air ions cause an increase in brain serotonin levels.
Two well-conducted studies have looked at the effects of air ionization on winter depression. Both of these studies compared a high-density air ionizer with a low-density ionizer. People sat in a room at home with the ionizer for 30 minutes every morning over a 2-3-week period. People with winter depression who used the high-density ionizer showed much more improvement than those who used the low-density ionizer. No studies have been carried out on air ionization as a treatment for other types of depression.
No side effects of air ionization have been found.
Source: RealMentalHealth.com
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