There's no need to rule out every house built before 1978, she says. Take a sample of paint to be tested for lead content and if lead-based paint is indeed in the house, take appropriate precautions. If remodeling or repairs create dust that may contain lead-based paint, clean it up as soon as possible using warm soapy water. Also check for potential allergens, Phoenix says. A house that tends to be moist produces molds that can trigger allergic attacks and asthma.
Dust mites and pests such as cockroaches also worsen allergies.
New homes still have issues, realtor Kathy Ging says. Modern building materials may release toxic chemicals for a considerable time. New carpets, for example, emit a host of toxic substances, including formaldehyde and pesticides. Carpet manufacturers even advise people to let new carpet and carpet pads air out for 72 hours, but most people skip this step. Ging is affiliated with Milestone Realty in Eugene, Ore., and specializes in finding healthy homes for such people.