Most of the free electrons produced by the ionization of molecules in the air under the action of high pressure or strong rays are obtained from oxygen. A negatively charged oxygen ion (negatively charged electrons) thus gains some electrons, which is called "negative oxygen ion".

Negative oxygen ions are called "air vitamins", which can affect human physiological activities through human nervous system and blood circulation.

Negative ions have the following main effects on human body:

1, which is the influence on the nervous system, can strengthen the function and mental activity of the cerebral cortex, invigorate the spirit, improve work efficiency and improve sleep quality. Negative ions can also strengthen the oxidation process of brain tissue, so that brain tissue can get more oxygen.

2. This is the influence on the cardiovascular system. According to scholars' observation, negative ions can obviously dilate blood vessels, relieve arterial vasospasm and achieve the purpose of lowering blood pressure. Negative ions are also beneficial to improve cardiac function and myocardial nutrition, and are beneficial to the rehabilitation of patients with hypertension and cardiovascular and cerebrovascular diseases.

3. It is the influence on the blood system. Studies have confirmed that negative ions can slow blood, prolong coagulation time and increase oxygen content in blood, which is beneficial to the transportation, absorption and utilization of blood oxygen.

4. Negative ions have the most obvious effect on respiratory system. This is because negative ions enter the human body through the respiratory tract and can improve people's vital capacity. After testing, inhaling negative air ions in the glass mask for 30 minutes can increase the amount of oxygen absorbed by the lungs by 2%, while the amount of carbon dioxide discharged can increase by 14.5%, so negative air ions can improve and increase lung function.