Consumer Reports:
Sharper Image's Ionic Breeze Quadra Silent Air Purifier and four other similar machines fail to significantly clean the air - but also release potentially unhealthy levels of ozone.

According to the Department of Environmental Protection:
"High levels of ozone irritate the respiratory system and can permanently damage the lungs. During times of unhealthy ozone levels, people with asthma and those with bronchitis are prone to breathing difficulties, especially children and elderly people."