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Source: Google News
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In the upper atmosphere, ozone gas helps shield us from damaging ultraviolet rays, but near ground level ozone is an irritant that can worsen asthma and decrease lung function.
While most indoor ozone comes from the outside, Consumer Reports recently found that significant amounts of ozone can be emitted by some air cleaners that do little to clean the air.
Back in 2003, CR tests of ionizing room air cleaners showed that models like Sharper Image's Ionic Breeze did a poor job removing dust and smoke from the air. (Sharper Image sued after Consumer Reports judged the company's Ionic Breeze Quadra "ineffective." Last year, a U.S. District Court dismissed the suit, ruling that Sharper Image had not shown the findings to be false.)
Now, CR's latest tests of these products show that some of the poorest-performing ionizing models also can expose you to potentially harmful levels of ozone.
How they work
Ionizing air cleaners impart an electrical charge to the air, creating charged molecules (known as ions) that are supposed to cling to airborne particles. Ionizing models that are also electrostatic precipitators (like those tested) add an oppositely charged collection plate designed to attract the particles. Ozone is produced as a byproduct when high voltage near the charging wires converts oxygen. The ozone then exits the machine and flows into the room.
These five failed the test
Air cleaners are not medical devices, so the Food and Drug Administration doesn't regulate their ozone output. Still, manufacturers often submit their products to a voluntary industry standard test that includes a test to see whether they produce more than 50 parts per billion (ppb) ozone — the FDA threshold for medical devices.
When CR tested five ionizing models in accordance with Underwriters Laboratories' (UL) standard for ozone emissions from electrostatic air cleaners, all failed by producing more than 50 ppb — as measured in a sealed polyethylene room at the specified 2 inches from each machine's discharge.
People don't live in sealed plastic rooms, so CR additionally tested these machines in an open, well-ventilated lab. Since ozone becomes diluted and rapidly dissipates indoors as it reacts with carpet, upholstery and other surfaces, Consumer Reports also measured levels 3 feet away from the source.
In these open-lab tests, two models — the IonizAir P4620 and the Surround Air XJ-2000 — emitted more than 150 and 300 ppb, respectively, 2 inches from the machine. The other models — the Sharper Image Professional Series Ionic Breeze Quadra S1737 SNX, the Ionic Pro CL-369, and the now-discontinued Brookstone Pure-Ion — emitted less than 50 ppb.
At 3 feet, none emitted more than 28 ppb.
Keep your distance
While few people are likely to sit 2 inches from a machine's air discharge, you could be exposed to higher levels than those measured at 3 feet if you take a cue from manufacturers. The IonizAir's box shows it on a desk near a keyboard and on a nightstand near a sleeping woman. The Ionic Pro CL-369 is shown by a sofa. The Surround Air's manual suggests placing it "nearby those suffering from breathing or other health problems."
Consumer Reports recommends you avoid these five ionizers; besides emitting significant amounts of ozone they performed poorly in separate tests of air-cleaning ability.
