In most homes, carpet is by far the biggest dust reservoir. It’s a huge source of fibers and absorbs dust like a giant sponge. Even the padding underneath holds dust, which goes airborne with each footstep. Although ripping out your wall-to-wall carpet may sound radical, it’s the best thing you can do if you suffer from serious allergies. Replace carpeting with hard flooring like laminate, wood or tile, and wet mop it regularly (with a microfiber cloth) instead of sweeping. Sweeping is more likely to stir up dust than to remove it.