1. The life of the negative oxygen ions is very short, in the clean air can exist for several minutes, and in dusty places only a few seconds.
2. Most of the negative ion air purification equipment sold in the market can only function in a very small amount of space.
3. The negative ions produced by traditional technology are often associated with the generation of ozone, positive ions and other derivatives.
4. Only the small particle size of the negative oxygen ions have a good air optimization effect.