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Volume 8, Issue 5
Published: September 8, 2014
Making diesel clean and sustainable

Regulators want to cut diesel engine emissions by more than 90% for both particulate matter (PM) and oxides of nitrogen (NOx), ultimately requiring major changes to engines and combustion, and major reliance on emissions control technologies not used previously on diesel engines – particulate filters and catalysts. It also required major changes to diesel fuel. Since sulfur comes out as a particulate when burned, and clogs catalysts and particulate filters at high levels, it had to be virtually eliminated. This led to the 2006 development of ultra-low sulfur diesel (ULSD) with 97% less sulfur than pre-2006 diesel. ULSD is the standard baseline fuel across the US in just about every diesel application. For the first time, EPA established linked engine emissions and fuel quality standards – a systems-based approach now known as clean diesel.

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