Mold and mildew often grows in bathrooms or dark, humid places. Other than being an unsightly nuisance, these molds can cause difficulty breathing or asthma attacks. A few molds can be toxic. Infants and children are at the greatest risk as their respiratory systems are not completely developed. Eliminate molds and mildews by ensuring all areas of the house are clean and dry, and by cleaning infected areas with a bleach and water solution.
Dust mites pose another respiratory threat.
To reduce exposure to these mites, wash bedding at least once a week, remove bulky curtains and extra rugs, keep only washable stuffed toys, and dust and vacuum regularly. House pets can be a problem if owners are allergic to them. The most common pet allergen is hair, but pet dander can be a problem. Take steps to prevent pets from lowering indoor air quality. These include bathing the pet often and grooming it outside, cleaning the house regularly and not letting the pet sleep in the room with the allergic person.