Clean your house.
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.