And do so frequently. "Toxins from household products, such as flame retardants in couches and chemicals used in electronics, accumulate in dust, which we then inhale," says Rotkin-Ellman. "Sweep, mop, and vacuum often, especially if you have young kids crawling around." But to limit the level of PFCs in your house in the first place, Rothkin-Ellman suggests skipping stain-resistant coatings for furniture and carpets and going with cast-iron pans instead of nonstick. She also advises taking your shoes off at the door to avoid tracking in outside contaminants such as pesticides and heavy metal–tainted soils.