The benefits of negative ions to the human body are numerous.

Oxygen, or oxygen molecules as learned in chemistry, represented by the chemical formula O2, constitutes 21% of the air. The concentration of oxygen increases as one gets closer to the Earth's surface, with most of it concentrated within a 20-kilometer range around the Earth's surface.

The Role of Oxygen: Oxygen is the essence of life, a vital substance in the metabolic processes of all animals and plants.

Ozone: Composed of oxygen atoms that are partially split from oxygen molecules by solar ultraviolet radiation and lightning (O+O2=O3), ozone has the chemical formula O3, featuring one more reactive oxygen atom than O2. The distribution of ozone in the atmosphere varies with latitude, season, and the alternation of day and night, with particularly high concentrations in the Earth's atmosphere between 20 to 30 kilometers above the surface, providing protective benefits to the planet.
Ozone's Role: Ozone is a powerful oxidizing agent that is highly unstable at room temperature and can readily decompose into oxygen molecules and atoms. These oxygen atoms possess strong oxidizing and decomposition capabilities. Consequently, ozone is effective in sterilization, odor removal, mold prevention, and air purification. In China, regulations state that exposure to 0.15ppm (where 1ppm equals 1×10^-6 volume concentration) for 8 hours is considered safe, with any exposure beyond this limit posing health risks. When using ozone-treated water at home for washing vegetables, clothes, marinating meat, etc., it is important to be cautious due to the potential hazards of high ozone concentration and prolonged exposure.

Air Negative Ions: Simply put, air negative ions are oxygen molecules that have captured an electron, also known as negative oxygen ions. The concentration of air negative ions determines the quality of the air. According to the World Health Organization, a concentration of no fewer than 1,000 to 1,500 air negative ions per cubic centimeter is required for fresh air.
Positive and negative ions in the air can be categorized into large, medium, and small ions based on their migration rates. Ions with migration rates greater than 0.4 cm²/(V·s) are considered small ions, those less than 0.04/(V·s) are large ions, and those in between are medium ions. Particles with charges close to the size of molecules, known as small air ions, belong to the smallest category. These small air ions have high velocities, collide with each other in the atmosphere, and continuously aggregate to form large or medium ions. Only small ions, or small ion clusters, can enter biological organisms. Among them, small negative oxygen ions, or small negative oxygen ion clusters, possess good biological activity. Ecological-grade negative ions are equivalent to natural air negative ions, being smaller in diameter and referred to as light ions or small ions. They are characterized by high activity and long migration distances. Medical research indicates that small-sized negative ions have health benefits for humans. This is because only small-sized negative ions can easily pass through the blood-brain barrier in the human body to exert their biological effects.

Negative oxygen ions in the air have the effects of removing dust, eliminating germs, and purifying the air. At the same time, the small-particle ecological-grade air negative ions are easily absorbed by the human body and can penetrate the blood-brain barrier to provide health care and therapy. They exert positive therapeutic effects on the human nervous system, circulatory system, respiratory system, urinary system, digestive system, and metabolic system, playing a crucial role in maintaining and safeguarding normal human functions, defending human health, and extending human lifespan.