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B. Diesel Exhaust Makes the Top 5 List of Worst Pollutants for Children

Narrator: This is Science Today. Diesel exhaust has recently been listed as one of the top five toxic pollutants that affect children in California. At the University of California, Riverside, researchers led by engineer Joe Norbeck, are conducting studies to precisely measure the impact of diesel exhaust.

Norbeck: One of the big debates in California is the toxicity and impact of heavy-duty diesel emissions and there is a lot of effort to essentially ban diesels. But one of the things is that there are a lot of technical uncertainties.

Narrator: Including getting accurate measurements of diesel exhaust from vehicles on the road, but Norbeck and his group built a trailer containing an emissions lab that can take measurements while being towed.

Norbeck: We have participation from the state of California agencies, the U.S. EPA, the oil companies and the diesel engine manufacturers and the trucking association. We're trying to get everyone at the table that will then agree that this is a research agenda that we need to do.

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