The program has pollution chambers where they can simulate the natural environment, complete with a 200kw light (simulates the sun) and a dozen 18" subwoofers (circulates the air). They start with clean air in the chambers and then pump in vehicle exhaust to measure air quality. It's a $4 million complex and is one of the most advanced pollution chambers in the world.
A project they're working on now is an in car GPS unit that uses real time info to get you from point A to B based on energy consumption and emissions, not shortest time. Forty percent of the time the shortest/quickest route doesn't equal the lowest emissions. A system like this could be used by fleet companies to conserve carbon emissions (read carbon trading).

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