Well that is a real tricky question as air filters have come under fire. Ionizing and ozone air purifiers have come under fire from consumer groups, consumer review magazines and even the Environmental Protection Agency (EPA). Two claims are at the heart of the controversy: that these types of air purifiers are not effective at removing contaminants from the air and that ozone generators could harm people.
In 2002 and 2003, Consumer Reports tested several different air purifiers, including Sharper Image’s Ionic Breeze. Independent researchers checked and verified the tests. Consumer Reports found that ionizing air purifiers like the Ionic Breeze created “almost no measurable reduction in airborne particles”. Sharper Image sued Consumer Reports. The magazine later conducted further tests in response to Sharper Image’s complaints and still found the Ionic Breeze to be ineffective.
However, HEPA filters are backed up with some legitimacy from our government and HEPA filters, by definition, remove at least 99.97% of airborne particles 0.3 micrometers (µm) in diameter.
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