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Kids, because they are lower to the ground and often put their hands in their mouths, breathe in or eat the dust on our homes' floors, shelves and windowsills.

Cats and dogs breathe it in, too, and also ingest it when they clean their fur with their tongues.

The average infant ingests 100 milligrams of dust each day, while some kids take in up to 10 grams per day, or about a third of an ounce, said Seattle environmental engineer John Roberts, in a chapter he wrote for a new book, "Exposure Analysis."

Here's what other studies found:

• ARIZONA: The dust in 1 percent to 10 percent of homes studied in the 1990s contained potentially significant amounts of heavy metals or pesticides. In general, they were risky only to kids or others who get very close to carpet.

The studies, by the University of Arizona School of Public Health, looked at dust samples from about 300 homes across Arizona, including 100 in Douglas, Nogales, Yuma and other cities within 60 miles of the Arizona-Mexico border.

• U.S.-WIDE: From home dust, the average U.S. child ingests the same amount of cancer-causing benzo(a)pyrene as he would get by smoking three cigarettes a day, says a 1998 Scientific American article by researchers Wayne Ott of Stanford University and John Roberts, a Seattle environmental engineer.