The carpet is considered an element of comfort. It feels great underfoot and its acoustic properties isolate the transmission of sound across the floor. It can also add a touch of luxury, look cozy and homey, or become the focal point of a modern, industrial-style space. But, as mentioned earlier, carpet fibers are porous. The material is a shell that traps dust, dirt, pollen, stains and moisture. If left in place, these irritants will enter the fibers and degrade indoor air quality.