The devices, also known as ionizing air cleaners or ionizers, work by electrically charging airborne particles and trapping them on oppositely charged metal plates. Ozone, a supercharged form of oxygen, is a byproduct of this process. In 2004, two studies linked high ozone exposure in cities to increases in premature deaths from respiratory and cardiovascular causes.
The new study, published in the May 2005 issue of Consumer Reports, gave failing grades to the Ionic Breeze, made by Sharper Image, and four other devices “for poor performance and some with relatively high ozone.” The products earned poor ratings from Consumers Union for removing dust, smoke and pollen from the air. The magazine also reported that some university studies were funded by the manufacturer. “If you own one of the five poor performing ionizers, try returning it for a refund,” Consumer Reports says.
Not all ionizing air cleaner models produce significant amounts of ozone. The magazine gave high marks to the Friedrich C-90A and Whirlpool 45030.
Consumer Reports and its nonprofit publisher, Consumers Union, have been testing the effectiveness of indoor air cleaners since 1992. Sharper Image sued Consumers Union for libel in 2003, but in 2004, a federal judge dismissed Sharper Image’s suit. The judge ruled that there was no reasonable probability that Consumers Union’s findings were false and that Sharper Image’s studies provided no basis for challenging the findings.
Consumers Union recommends that the Consumer Product Safety Commission set indoor ozone limits for all air cleaners and mandate performance tests and labels disclosing the results. The union also advises that the Federal Trade Commission take a closer look at advertisements for these devices to determine whether they include deceptive claims. Consumer Reports will issue a full report later this year.
Keep the Air Fresh
The Environmental Protection Agency and the American Lung Association recommend several low- or no-cost indoor air cleaning methods:
Reduce indoor pollutants. Ban indoor smoking. Minimize candles, incense and wood-burning fires, and use unscented cleaners.
Wash linens in hot water. Keep dust-sensitive people out of the area when vacuuming. Keep solvents, pesticides and heavy-duty cleaners outside.
Keep your home well ventilated. Use outdoor-venting exhaust fans in the kitchen, bath and laundry areas to reduce moisture and airborne particles that can breed respiratory irritants. Maintain heating and cooling equipment, chimneys and vents to minimize the presence of carbon monoxide in your living space.
Best and Worst
Ionic Pro CL-369
Surround Air XJ-2000
Sharper Image Professional Series:
Ionic Breeze Quadra SI737 SNX