Honda has announced a new "ultra-clean" diesel fuel system. Diesel engines now power half of Europe's new cars and are slowly becoming popular with fuel-conscious consumers around the world. They typically get 30% better mileage than gasoline cars, but their weakness has been the higher exhaust levels of nitrogen oxide (NOx), a greenhouse gas.
Honda said its new diesel system has a unique method that generates and stores ammonia within a two-layer catalytic converter to turn nitrogen oxide into harmless nitrogen.
The company plans to introduce the new engine in the United States within three years.
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