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B. An Innovative Way to Measure Heavy-duty Diesel Emissions

Narrator: This is Science Today. Measuring emissions generated from engines under "real world" operating conditions is difficult because the results can vary greatly. But researchers at the University of California, Riverside are now using a high-tech, lab-on-wheels to measure the emissions produced by heavy-duty diesel engines. Joe Norbeck is director of the university's Center for Environmental Research and Technology.

Norbeck: We've put together an emissions laboratory that's unique in the world. We took a fifty-five foot trailer that you see driving along these large trailers that heavy-duty diesel engines pull and we put a very elaborate and sophisticated emissions laboratory inside this 55-foot trailer.

Narrator: The diesel tractors then pull around this trailer, while instruments inside take detailed measurements of the composition of the exhaust.

Norbeck: We're now going to not only be able to understand better the emissions of the current vehicle fleet, but to see what the impact will be with control strategies.

Narrator: For Science Today, I'm Larissa Branin.