Before we can know how an air ion purifier works, we must first learn what an ion is. An ion is best described as a small charge of static electricity that can be positive or negative by nature and is found in the air we breathe. It can be good or bad depending on the amount of positive or negative charge it carries. High levels of positive ions can cause depression, migraines and asthma. High negative charged ions are calming and soothing. Just before a lightning storm, the air is heavily charged with positive ions and afterwards, it is highly charged with negative ions. An air ion purifier is designed to put more negative ions into the air causing the positive ones to go somewhere. The problem may be that instead of going into the filter, they can cling to anything including the walls, windows, or clothing. They are not floating in the air, but just waiting to be free to float through the air again. The air ion purifier has prevented the bad ions from floating in the air, but not destroyed them.
More on best air purifier and uv air purifier