Source of Ozone:
In A. D. 1785 a German, Van Marum by name, found that there was a special smell of grass in the bracing air after thundershower and later acknowledged the existence of ozone. An ozone (O3) is formulated by combination of an oxygen molecule (O2) with an oxygen atom (O), which is freed by ultraviolet radiation in sunshine or produced by high voltage of lighting. Not until 1840, nevertheless, did a German chemist called Schonbein name it ozone in Egyptian word "OZONE" which means fresh air. Most ozone exists in the woods and on seashore, except for the tremendous quantity of it in the upper stratus of atmosphere warding off the ultraviolet rays.

Property of Ozone:
Ozone is a triatomic form of oxygen with its molecular formula of O3, molecular weight: 48, melting point:-192.70oC, boiling point:-111.90oC, specific gravity: about 1.7 and 1.5 times greater than air and oxygen respectively. It is an inflammable and easily water-soluble gas, with no color and no poison. In its thin concentration it has a specific grassy smell of the refreshing air near a forestry or beach, in the high concentration it is bluish with a irritating pungent odor.
Ozone of O3 is an isotope of oxygen, a kind of highly active and unstable gas whose one molecule even at the normal temperature of 18-30oC quickly resolves into one O2 of oxygen and one O of oxygen atom. When it reduces into oxygen, oxygen atoms become free. An oxygen atom is extremely chemically active, having very strong oxidizing, disintegrating and neutralizing ability, three thousand times more powerful in killing bacteria than chlorine.

Functions and applications of ozone:
1. Oxidize, disintegrate and neutralize assorted innocuous gases and substances such as carbon monoxide, carbon dioxide, methane and benzene etc.
2. Has a strong ability to remove smoke and toxin, to bleach and do good to health. Prolong the span of foods' freshness.
3. Retard and kill assorted bacteria and viruses such as mould, cold virus and tubercle bacillus. Ozone is widely applied in medical field, especially in treatment of allergy, asthma, athlete's foot and dermatosis.

Introduction to Negative Ion:
There are positive and negative charges in the air. Integration of positive charge and ion forms cation and that of negative charge and ion forms anion. Discharge of a high-voltage-exerted pin electrode is also able to produce voluminous anions. Anion is able to agglomerate the suspended particles, smoke and dust in the room into bigger granules that sink more quickly. At the same time, The negative charged suspended particles are absorbed by charged cellular net and distinctively designed dust-collecting plate, the atmospheric ambience becomes clear and bracing accordingly.

Functions and applications of anions:
1. Be able to vitalize our cells, increase the oxygen holding capacity of blood and improve metabolism. Teemed with anions, cells are full of vim and vigor.
2. Be able to remove fatigue, boost our resistance to diseases and ameliorate autonomic nervous system. Anions have a substantial curative effect upon headache, insomnia, constipation, melancholy, pollinosis and allergic rhinitis etc.
3. Anions with ozone are able to immediately remove the stink of mould, the offensive odor of smoking, retard and kill colon bacilli, dysenteric bacteria and tubercle bacillus etc. What's more, Anions have also a special curative function in treatment of chronic bronchitis and asthma.