空气负离子也叫负氧离子，是指获得多余电子而带负电荷的氧气离子。
Air anion, also known as negative oxygen ion, refers to the oxygen ion with negative charge to obtain extra electrons.
长久待在都市密闭房间内，人们会觉得头昏脑涨，当来到森林海边、瀑布等地方的时候，我们会觉得神清气爽， 这就是空气负离子的作用。空气负离子也叫负氧离子，是指获得多余电子而带负电荷的氧气离子。它是空气中的氧分子结合了自由电子而形成的。自然界的放电（闪电）现象、光电效应、喷泉、瀑布等都能使周围空气电离，形成负氧离子。负氧离子在医学界享有“维他氧”、“空气维生素”、“长寿素”、“空气维他命”等美称。
People will feel dizzy and dizzy when they stay in an urban airtight room for a long time. When they come to the forest, seaside, waterfall and other places, we will feel refreshed. This is the role of air anion. Air anion, also known as negative oxygen ion, refers to the oxygen ion with negative charge to obtain extra electrons. It is formed by the combination of free electrons with oxygen molecules in the air. Discharge (lightning) phenomenon, photoelectric effect, fountain and waterfall in nature can ionize the surrounding air and form negative oxygen ions. Negative oxygen ion enjoys the reputation of "Vita oxygen", "air vitamin", "longevity element", "air vitamin" and so on.