Stuff They Don't Want You To Know cover image

CLASSIC: The Great Volkswagen Cover-up, with Scott Benjamin

Stuff They Don't Want You To Know

00:00

The Different Types of Exhaust Gases Out of the Tailpipe

All vehicles in developed countries must conform to certain sets of standards. This includes everything from the presence of airbags to break standards. The rules vary state by state, with some states requiring emissions testing every single year and others not at all. In order to buy or sell cars here in the United States, you have to meet these mandates.

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