Last year, Sharper Image settled a class-action lawsuit which alleged that the company misled customers about the effectiveness of their Ionic Breeze air purifiers. Sharper Image agreed to offer $19 merchandise credits to each of their 3.2 million customers who've bought an Ionic Breeze air purifier since May 6, 1999. The company also agreed to pay $1.875 million in legal fees to settle the case.

Like other ionic air purifiers, the Ionic Breeze emits ozone. Ozone is a lung irritant that can actually cause allergy and asthma attacks!

Consumer Reports initiated Sharper Image's downward spiral by publishing several negative reviews of the Ionic Breeze air cleaner.

Yesterday, Sharper Image filed for Chapter 11 bankruptcy protection, according to CCN Money. They're currently seeking a loan to continue operating, and they have plans to close 60 of their 183 stores.

If you have allergies or asthma, stay away from ionic air cleaners; instead, choose a HEPA air purifier.

Learn more with the Air Purifier Buying Guide.