The scented fabric sheet makes your shirts and socks smell flowery fresh and clean. That plug-in air freshener fills your home with inviting fragrances of apple and cinnamon or a country garden.

But those common household items are potentially exposing your family and friends to dangerous chemicals, a University of Washington study has found.

Trouble is, you have no way of knowing it. Manufacturers of detergents, laundry sheets and air fresheners aren't required to list all of their ingredients on their labels -- or anywhere else. Laws protecting people from indoor air pollution from consumer products are limited.

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