A broad-based medical research project called "The Inner City Asthma Study" followed nearly 1,000 inner city kids with moderate to severe asthma over a period of three years. Adult caretakers were instructed in proper cleaning and allergen reduction through the removal of insects, rodents, mold, tobacco smoke and pets. Households were given high-efficiency vacuum cleaners and in some instances, air filters. Even though the study organizers wanted to have carpet removed prior to the study and recommended carpet removal wherever possible, results showed that children with asthma fared much better in cleaner homes, and that there was no difference in symptom improvement between homes with carpet and homes with hard surface floors. In addition, there was no difference in the levels of measured allergens in homes with carpet versus homes with hard surfaces.
This study would certainly support the Carpet and Rug Institute's position that clean floors are healthy floors, and that carpet is a good choice for any home, including those of persons with asthma and/or allergies.