Allergens

Some biopollutants, such as animals, dander, house dust mites, and mold, have been linked to allergies and asthma, and many of these substances are commonly found in the average home.  It is important to understand that the mere presence of allergens does not in itself pose a hazard.  The allergen must be inhaled for exposure to occur, and in order for inhalation to occur, the allergen must be airborne.

Carpet acts as a trap for allergens

Carpet is capable of holding significant quantities of soil, dust, etc., without appearing very dirty.  It has been demonstrated that carpet is quite efficient at keeping allergen and other small particles such as pollen out of the air.  In fact, data from a Swedish government study indicates that when use of carpet declined, the number of people reporting allergy problems increased.

Regular vacuuming with a vacuum using a high-efficiency filter and periodic cleaning using the hot-water extraction cleaning (“steam cleaning”) removes the majority of allergen from carpet as well as significantly reducing mite populations.

Research has clearly shown that there is no correlation between allergen contained in carpet and allergen in the air in the carpeted room.

Research on carpet

In 2002, two schools in North Carolina were the subject of a study conducted by Research Triangle Institue (RTI) and University of North Carolina (UNC) investigators.  One school had mostly resilient tile floors, while the other was 70-75% carpeted. The study found that airborne contaminants, possible sources of allergens, were higher over the tiled floors than over carpet.

Also in 2002, Professional Testing Laboratory studied the effect of foot traffic on air quality, using commercial carpet and commercial vinyl flooring.  Following 16 minutes of foot traffic over both surfaces, the particulate concentration over the vinyl floor was found to be four times that of carpet.

Other studies, including one using Computational Fluid Dynamics (CFD), have reinforced these findings and concluded that carpets actually reduce exposure to particulates and potential adverse health effects.

In a recent paper, “Carpet, Asthma and Allergies – Myth or Realty,” Dr. Mitchell Sauerhoff, Ph.D., DABT, examined numerous scientific studies and other research contradicting some long-held beliefs on carpet’s alleged negative characteristics.

Sauerhoff concluded, “…based on the available science, carpet does not cause asthma or allergies and does not increase the incidence or severity of asthma or allergies symptoms. In fact, with respect to asthma and allergies, multiple studies have reported fewer allergy and asthma symptoms associated with carpet.”

These widely used comments have stemmed from unfortunate encounters with uninformed
cleaners that have left the carpet with an overload of detergent residue. The consumer has assumed that this is the case with all carpet cleaning and resolved to wait until the carpet is in dire straights to clean it.

The good news is that a properly cleaned carpet will not re-soil as quickly and will actually last
longer. Why? Because damaging soils are removed with effective cleaning. Soil that is
not removed by vacuuming, even though it can rarely be seen by the naked eye, cuts and slices
on the carpet fibers as the carpet is being walked on breaking down the carpet yarns in the
traffic areas. The result is that even with restorative cleaning at that point, it will not correct the damage that has been done to the fiber. Fiber producers and carpet manufacturers recommend that a residential carpet should be professionally cleaned at least 18 to 24 months for best performance, more often in heavily trafficked and heavy soiling situations.

A Clean Carpet is a Healthy Carpet

Not to mention that a carpet that is not cleaned on a regular basis is an unhealthy carpet. Carpet is like a filter. It collects soils, pollens, insecticides, exhaust, etc. that gets tracked in or blown in from the polluted outdoors. This creates and unhealthy indoor environment.