Summary
Most people are unaware that there are at least 4 different types of ionic air purifier in use today. Ionizers have been around for many years.
How effective are they?
A simplified explanation of the process: The ionic air purifier produces ions. The ions attach themselves to particles (opposite charges attract). The particles attach themselves to other particles or collection devices or charged surfaces and are removed from the air. The details depend on the type of ionic air purifier used. Ionization and ions are produced and are present in the air we breathe outside. Ions are measured by how many are present in a cubic centimeter or cm3. “Typical” clean air outside contains 3000 positive(+) and 4000 negative(-) ions per cm3. This amount can be influenced by a myriad of factors and is constantly changing and constantly replenished by sun, wind, and storms.
After detailed research it is my conclusion that the natural balance of ions outdoors is generally better than our indoor environments.
Have you ever felt like getting outside to get a breath of fresh air? Interestingly enough, some scientists point to +/- ions as part of the reason for outside air “feeling right”.
Now, unfortunately indoor air does presents a problem for ions. In most cases the number of ions is drastically reduced compared to outside air.
Sometimes there are too many positive ions and an imbalance occurs. Generally the imbalance leans towards the positive, but another problem could occur if too many negative ions are present. A balance is best, just like outside.
In-Depth Reference(s)
Wikipedia has general background about ionization (opens a new window)
Buying Considerations
Do your homework.
Because there are several versions of this technology, it can be hard to select the right one. I would stay away from single charge ionizers all-together. Even within the other technology types you need to search diligently for a quality ionic air purifier. Realize that there are really only a handful of companies with a “trust factor” track record. Be wary of the others as marketing hype as well as copy cats and small time vendors exist.
Lastly, the RCI version has a replaceable UV lamp or RCI cell that will need to be replaced every few years. Know and calculate the ongoing cost before purchasing.
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