Compared to smooth linoleum floors, carpet fibers provide vast surface areas for thriving growth of bacteria, mites and fungi. Mold and mildew flourish in an environment kept moist by basement condensation and snow and water brought in on shoes during winter months. The large surface area of the carpet fibers and of the dust particles themselves increases the deposition, storage, and release of gases and fine particles. Food particles are ground into carpets, providing nourishment for microbes and small insects. Tracked in dust also builds up in carpets.
Studies suggest up to two thirds of dust in buildings is tracked in on occupants feet.
Oil and salt laden dust from parking lots Pesticides from roadsides and school grounds Lead from old paint dust in the soil around the building Solvents from cleaning agents used in other areas of the school. Carpet removal is the best long term solution Carpet cleaning efficiency is highly variable and seldom removes deep dust. In addition, carpet-cleaning products can contain irritants and heavy perfume agents that can cause reactions in sensitive individuals. Carpets continue to accumulate and release contaminants throughout their life. Replacement of fitted carpets with low surface area flooring, such as linoleum, is already being done by a number of Vermont schools and should be considered in long-term maintenance and replacement plans for all carpeted areas.