A just-released study says more than half of children's car seats sold in the U-S contain hazardous chemicals.

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The environmental group Ecology Center tested more than 150 car seats.

Researches discovered 60 percent of the seats were made with chemicals like chlorine and lead, which are sometimes used as additives in plastics.

The group did not say the levels discovered were high enough to be harmful.
It says there has been a 64 percent improvement between the 2008 and 2011 models.

The most toxic car seats, as ranked by the Ecology Center, are as follows:

•Infant Seat: Graco Snugride 35 in Edgemont Red/Black & Graco SnugRide 30 in Asprey
•Convertible Seat: Britax Marathon 70 in Jet Set & Britax Marathon in Platinum
•Booster Seat: Recaro Pro Booster in Blue Opal & Recaro ProSPORT Toddler in Mist

The group ranks these seats as the least toxic in its 2011 test:

•Infant Seat: Chicco KeyFit 30 in Limonata, Graco Snugride 35 in Laguna Bay & Combi Shuttle 33 in Cranberry Noche
•Convertible Carseat: Graco Comfort Sport in Caleo, Graco MyRide 65 in Chandler and Streamer, Safety 1st OnSide Air in Clearwater, and Graco Nautilus Elite 3-in-1 in Gabe
•Booster Seat: Graco Turbo Booster in Anders

You can see the list here.