Diesel and Urea

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The Professor discusses some of the chemistry behind the recent controversy involving Volkswagen cars.
CLARIFICATION: While many diesel engines (including VW cars) use urea as discussed (marketed as AdBlue), we've heard from viewers explaining the technique VW "fiddled with the computer" used another NOX-removal technology. (The Prof is in India without web access but sends apologies for any confusion he caused)
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