Carpet and Allergies: Dust Mites, Pet Dander, Mold and How Cleaning Helps

Carpet does not cause allergies, but it can hold the things that trigger them. The U.S. Environmental Protection Agency’s asthma guidance names several common triggers that collect in carpets and rugs. For a household with allergies or asthma, how you clean matters as much as how often.

What collects in carpet

Trigger	Where EPA says it is found	Main control
Dust mites	Mattresses, pillows, carpets, upholstered furniture, bedcovers, stuffed toys	Weekly vacuuming, washing bedding, dry air
Pet dander	Skin flakes, urine, saliva and hair, carried into carpets and furniture	Keep pets out of bedrooms and off carpets where possible
Mold	Damp spots, including the underside of carpets and pads	Control moisture; dry within 24 to 48 hours
Chemical irritants	Products such as cleaners that release volatile organic compounds	Ventilate; follow labels; choose safer products

Dust mites

EPA explains that dust mites are too small to see, that every home has them, and that they feed on human skin flakes. Their body parts and droppings can trigger asthma in people allergic to them, and exposure can cause asthma in children who had no symptoms before. EPA’s steps:

• Wash bedding in hot water once a week and dry it completely.
• Use dust-proof covers on pillows and mattresses.
• Vacuum carpets and furniture every week.
• Dust often with a damp cloth.
• Use a vacuum with a HEPA filter on carpet and fabric-covered furniture.
• Have people with asthma or allergies leave the area while it is vacuumed.

Pets

Proteins in a pet’s skin flakes, urine, feces, saliva and hair can trigger asthma, EPA says, and dogs, cats, rodents and other warm-blooded mammals can all be sources. Its most effective recommendation is to keep animals out of the home. Where that is not realistic, EPA lists isolation measures: keep pets out of sleeping areas and away from upholstered furniture, carpets and stuffed toys, and keep them outdoors as much as possible. If a pet leaves the home, thoroughly clean floors, walls, carpets and upholstered furniture. Accidents need full cleaning too; see Pet Stains and Odors on Carpet: A Vet-School Method That Stops Repeat Accidents.

Mold

For people sensitive to molds, inhaling spores can trigger an asthma attack. EPA’s mold guide notes that mold can hide on the underside of carpets and pads, and that molds are usually not a problem indoors unless spores land on a wet or damp spot and begin growing. The key is moisture: dry wet materials within 24 to 48 hours and keep indoor humidity below 60 percent, ideally between 30 and 50 percent. In Middle Tennessee summers that takes deliberate effort; see Nashville Humidity and Carpet Care: Keeping Rugs Dry Through Rainy Springs and Muggy Summers.

A small humidity meter, which EPA says costs about $10 to $50 at hardware stores, tells you whether your air conditioning is keeping indoor humidity in the recommended range.

What mold does to sensitive people

EPA explains that molds produce allergens, irritants and in some cases potentially toxic substances, and that inhaling or touching mold or spores may cause allergic reactions in sensitive people. Allergic reactions to mold are common, with hay fever-type symptoms such as sneezing, runny nose, red eyes and skin rash. Because dead mold can still cause reactions, EPA says it must be removed, not just killed.

Fresh air matters too

EPA’s introduction to indoor air quality notes that if too little outdoor air enters a home, pollutants can accumulate to levels that cause health and comfort problems, and that unvented or malfunctioning appliances and improperly used products can release higher levels of pollutants indoors. Airing out a room after vacuuming or cleaning helps clear what the cleaning stirred up.

Cleaning without adding irritants

Cleaning products can add their own irritants. EPA reports that many volatile organic compounds are consistently higher indoors, up to ten times higher, than outdoors, and recommends increasing ventilation when using products that emit them and following label instructions carefully. Its Safer Choice label identifies products whose every ingredient has been reviewed for human health and environmental safety. See Carpet Stain Removal: A Careful Method and Safer Products.

Should you remove carpet?

Some allergic households replace carpet in bedrooms with hard flooring and washable rugs, which are easier to keep free of dust and dander. That is a personal and medical decision; talk to your doctor or allergist. If you keep carpet, the weekly HEPA routine above and dry indoor air are the foundation.

Professional cleaning and allergies

A professional cleaning can remove soil that vacuuming leaves behind, but it adds moisture. Ask the company how it will dry the carpet and what products it uses, as listed in Questions to Ask a Carpet Cleaner Before You Book, and the Answers to Listen For, and plan for the allergic person to be out of the house while the work is done and until the carpet is dry.