How much lead, chlorine, bromine and other hazardous-to-your-health chemicals do these car interiors pack?

HealthStuff.org's fourth annual review of popular car models' interiors uses X-ray fluorescence imaging to measure the levels of potentially toxic chemicals emitted by materials used to make everything from car seats to dashboards and even shift knobs.

Honda and its luxury brand Acura scored four top-10 finishes out of more than 200 popular 2011 and 2012 models tested. The bottom 10 is a mixed bag of American, Japanese and Korean models with readings three times higher than the 10 top-ranked vehicles.

The Ecology Center in Washington, D.C., which operates HealthyStuff.org, noted most automakers improved their ratings over the previous tests of 2009/2010 models, with Volkswagen up 42 per cent and Mitsubishi up 38 per cent despite having cars in the bottom 10 group.

Daimler, makers of Mercedes-Benz and Smart cars, and Volvo declined 29 and 13 per cent respectively. Click through the gallery to see the 10 worst-rated cars.

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