Co2 emissions from diesel engines

For decades, diesel trucks and buses have spewed large amounts of soot, smog-causing gases and carcinogens into the air.

But new diesel engines are more than 90 percent cleaner than a few years ago, far exceeding the emission reductions required by the U.S.

Environmental Protection Agency, according to a new study released Thursday.

The quest to clean up diesels has been mounted for several decades, yet its progress has long lagged behind the success stories of car exhaust.

Is diesel cleaner than gas

But now tests--conducted by independent researchers funded by a coalition of government and industry--now show the diesel technologies are working even better than expected. Truck and bus engines are much cleaner than they are required to be under new federal standards, and for many pollutants, the latest models are emitting the same levels as gasoline-powered automobiles, the researchers said.

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