Although we are becoming much more aware of how tailpipe emissions can make you and the planet sick, the Ecology Center is reporting on the toxicity of the materials used in vehicle interiors.

According to the Ecology Center's second annual Automotive Plastics Report,Toyota, Ford and Honda are the best of the big auto companies at limiting the use of toxic plastic materials.

The average vehicle uses 250 lbs of plastic, including chemicals such as "phthalates in polyvinyl chloride (PVC) and brominated flame retardants or(BFRs). "

Although the study says things are improving, the auto industry's report card looks a bit like Bart Simpson's:

Toyota C+, Ford C, Honda C, DaimlerChrysler D+, General Motors D, Hyundai D, Nissan D Volkswagen D-.

Ford was touted for its improvements over last year, including developing a soy-based foam, and a corn-based bio-fabric for seating. DaimlerChrysler increased the use of renewable materials by 98 percent over some previous models.

The EPA doesn't monitor the air quality inside new vehicles, so it may be better to drive new cars with the windows open.