九洲封头

Scientific evidence has demonstrated that atmospheric negative oxygen ions (NOIs) naturally occurring in the air are beneficial to human health, earning them the title of "vitamins in the air." The concentration of atmospheric negative oxygen ions positively reflects the freshness of the air, and it has become an indispensable and critical indicator in the ecological, environmental, and air quality assessment systems. This article delves into the analysis of atmospheric negative oxygen ions and their variation patterns in different environments, aiming to enhance public understanding of these particles.

Atmospheric Negative Ions Versus Negative Oxygen Ions
Atmospheric Negative Ions: These are negatively charged particles in the atmosphere, formed when neutral gas molecules in the air combine with free electrons. They are collectively referred to as negatively charged particles in the atmosphere.

Atmospheric Negative Oxygen Ions: Specifically, these are oxygen molecules in the atmosphere that have combined with free electrons, resulting in negatively charged oxygen ions. These are colorless, odorless, and often referred to as small-sized negative ions.

Under the influence of cosmic rays, ultraviolet radiation, trace element radiation, high-voltage electric fields, lightning strikes, and collisions with water molecules, the air undergoes ionization, releasing electrons that become free and negatively charged. These free electrons are captured by air molecules, aerosols, fine particles, etc., becoming negatively charged and forming atmospheric negative ions. Atmospheric negative oxygen ions constitute only a small portion of all negative ions, accounting for approximately 10-20% of the total. On the other hand, aerosols and fine particles that can be harmful to humans contribute to over 50% of the total negative ion count.

Environments rich in oxygen, such as forests and wetlands, increase the content of negative oxygen ions, while aerosols and fine particles in urban areas significantly impact their concentration.

Negative Oxygen Ion Concentration and Human Health
High concentrations of negative oxygen ions found in natural settings like forests, wetlands, waterfalls, fountains, and areas with flowing waterfalls are highly beneficial to human health.

However, high concentrations of negative oxygen ions generated by radiation exposure can pose severe health risks. For instance, in closed, newly decorated rooms, the concentration of negative oxygen ions can reach 2000-3000 ions/cm³. Further testing reveals that the high levels are due to the excitation of gases like radon, indicating that such high concentrations of negative oxygen ions can be detrimental to human health. Field monitoring has also found exceptionally high concentrations of negative oxygen ions in some mountainous areas, but these are often attributed to radioactive minerals in the vicinity, where radiation triggers the production of high levels of negative oxygen ions, rather than photosynthesis by plants.

Analysis of the Variation of Atmospheric Negative Oxygen Ion Concentration
Based on continuous monitoring data from three stations in Hubei Province, including Shennongjia, Yichang, and Jingzhou, this article analyzes the variation patterns of negative oxygen ion concentration influenced by geographical conditions, meteorological factors, and other variables. In general, domestic environments exhibit the following ranges:

Near waterfalls and fountains: 1000-10000 ions/cm³
In mountains, forests, and seaside areas: 500-2000 ions/cm³
In parks: 200-1000 ions/cm³
In urban centers: 50-300 ions/cm³