If you're shopping for an air cleaner, you'll find two main types. The best kind simply filter bad stuff (pet dander, dust, pollen, smoke, etc.) out of the air you breathe. But other air purifiers try to "clean" the air by pumping out ozone -- a chemical that's actually helpful as long as it lingers in Earth's stratosphere, screening out the sun's damaging ultraviolet (UV) rays, and that turns dangerous when it descends into the air we breathe. ("Good up high, bad nearby," as the U.S Environmental Protection Agency says.) These so-called "air purifiers" can actually pollute your home's air and trigger breathing problems, experts warn in our latest report on air purifiers.
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