Here is a question-and-answer look at the problem.

Q: What are chemical flame retardants?

A: Synthetic chemicals called polybrominated diphenyl ethers, or PBDEs, that help prevent the spread of fire by impeding the chemical reaction that causes it. They are commonly found in polyurethane foam products, such as the padding in furniture, as well as in textiles, televisions and computers.

Q: What's the concern?

A: The main concern is that PBDEs build up in the body over time. Data on how they affect humans are slowly emerging. Animal studies have shown that PBDEs harm the nervous system and alter hormonal functions and the development of reproductive organs. The most common flame retardant in use today has been found to cause cancer in laboratory rats. Industry officials, however, have argued that the levels in people and the environment are low and that this commonly used flame retardant is safe. "It remains the most studied flame retardant on the market, probably in history," said John Kyte, North American program director for the Bromine Science and Environmental Forum, an industry trade association.

Q: What's being done?

A: The average American household has more than two television sets. Many companies, including Sony Corp., are phasing out the use of PBDEs in televisions.

Q: What should you do?

A: The most important things are to wash your hands often and dust your house. A study last year by researchers at Boston University's School of Public Health linked the presence of the flame retardants found in people to exposure to common dust, which can be inhaled in the air or ingested in food.

— McClatchy Newspapers