It's true that a home ozone air purifier (while good at smoke, mold and odor) can hurt your lungs and airways. But let's start by explaining the difference between ozone and ions, because they are two different things. Certainly there is a lot of confusion for consumers about the difference, and the controversy about ozone.
Ozone Explained - Ozone is a very unstable substance, which makes it good for cleaning smoke and odors from the air. It does not help with dust and pollen. However it is nothing more than oxygen (O2) with an added molecule (making it O3). Simple enough, but what does this mean? It's that extra molecule, created by an electrical process, that can go out into the air and because it is unstable it will attach itself to gas molecules (odor, smoke) and some living molecules (mold spores) killing or disabling them. Unfortunately this is what, at certain levels, also harms the lung tissues.
The problem with Ionizer plates, or truman cells, is that ionizers can create ozone as a "byproduct". This is why the Sharper Image company had to remove the "ionic Breeze" from the market. And despite claims by Oreck that their machine does not produce ozone consumers are complaining about an "odor" from their machines.
Ecoquest- Now owned by Vollara. A multi-level marketing company. They sell for over $500
Alpine - The earlier name of the Ecoquest Company. The name changes have been as the result of the government cracking down on the claims by Ecoquest and Alpine as to teh health benefits, as well as consumer complaints from ozone problems.
However if you have allergies or any kind of lung problems stay away from Ozone. It does not gather dust or pollen and it can harm your lungs. My primary air purifier starts with HEPA and UV - to gather dust and pollen - and UV, to kill germs, odors, and bacteria.