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Advancements In Clean Diesel Technology And Fuel To Continue Major Reductions In Black Carbon Emissions

Diesel Responsible For Less Than 6% of Particulate Emissions in U.S."Numerous studies and reports from the U.S. Environmental Protection Agency (EPA), researchers and health organizations are highlighting the benefits and importance of clean diesel technology in reducing black carbon emissions in the U.S.," Schaeffer said. "Thanks to the switch to ultra-low sulfur diesel fuel coupled with advances in diesel engine design and emissions control technology, fine particulate emissions have been virtually eliminated from new diesel vehicles and equipment in the U.S.

"Today diesel engines are responsible for less than six percent of all particulate emissions in the U.S.," Schaeffer said.

Black Carbon to Decline by 86% by 2030 "Largely Due to Controls on New Mobile Diesel Engines" – U.S. EPA 2012 Black Carbon Report to Congress Schaeffer said that according to the U.S. Environmental Protection Agency's 2012 Report on Black Carbon to Congress, the U.S. currently accounts for about eight percent of the global black carbon emissions, with 52 percent of that coming from mobile sources, and 93 percent of the mobile sources attributed to diesel engines.  On top of the 32 percent reduction from 1990-2005, EPA projects this percentage will decline by 86 percent by 2030 'largely due to controls on new mobile diesel engines'.

"Much of the progress in clean diesel technology in the U.S. can be attributed to the systems based approach that recognized the essential aspect of cleaner, ultra-low sulfur diesel fuel as being the foundation for making large scale changes in engine design and enabled the use of emissions control technology that today result in near zero emissions of particulate matter," Schaeffer said.

"Today, lower-sulfur diesel fuels are not widely available or utilized in all parts of the world.   The World Fuels Charter, established by engine and vehicle manufacturers in the U.S., Japan and Europe, lays out such a blueprint for aligning fuel composition and implementation policies with environmental and other societal objectives.

"Whether or not this new study results in more scientific consensus on the role of black carbon emissions on the earth's climate remains to be seen.  We do know that the most dramatic changes in history to fuels and emissions levels from diesel engines have occurred after the study period o 1750 to 2000.   We look forward to understanding how these changes to both the levels of emissions and their composition inform current scientific understanding and future policy choices," Schaeffer said. 

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