Taken from the FAQ right on Sharper Image's website:
http://www.sharperimage.com/us/en/catalog/pipmoreshell1.jhtml?pageType=FAQ&sku=&pid=58036000&catid=21&pcatid=21&nickname=
20. What is the fresh scent the Ionic Breeze sometimes produces?
That faint scent is ozone (O3), a molecule consisting of three oxygen atoms. It is a common component of outdoor air. The U.S. government has set safe standards for ozone and the Ionic Breeze GP complies with those standards.
21. Is the Ionic Breeze GP or Quadra an "ozone generator"?
No, they are not. An ozone generator is a device specifically designed to produce large amounts of ozone as its primary method of treating and removing odors from indoor air. The EPA regards such ozone generators as unsafe for home use. The Ionic Breeze GP and Quadra, in contrast, release only small, trace amounts of ozone ? sufficient to eliminate many common household odors but insufficient to cause any concern. Because this amount is so small and incidental, Ionic Breeze Silent Air Purifiers are considered not to be ozone generators. Ionic Breeze GP and Quadra are electrostatic air cleaners that meet all government standards for safety, including ozone release.
The Ionic Breeze complies with U.S. safety standards for low ozone emission (less than 50 parts per billion). We recommend that individuals with a history of respiratory disease consult their doctor about possible heightened sensitivity to very low ozone.
22. What is CADR?
CADR stands for Clean Air Delivery Rate, and it is a way to measure how fast an air cleaner removes airborne contaminants over a short period of time. CADR is a standard laboratory test for some manufacturers in the air-cleaner industry, using a specific size chamber with premeasured levels of airborne particulates.
23. Does CADR measure the effectiveness of the Ionic Breeze GP or Quadra?
No, not at all. CADR is not designed to test the new Ionic Breeze technology, which has a low air-speed flow versus conventional kinds of air cleaners that rely on a high-speed airflow for their operation. One key to the Ionic Breeze's efficiency and effectiveness is its silent, 24-hour operation. Its airflow is slower but constant.