WASHINGTON – It took about four years, but as of Dec. 1, all highway diesel fuel in the U.S. is ultra-low sulfur diesel (ULSD) fuel.
ULSD, which has a lowered sulfur content ( from 500 ppm to 15 ppm), became standard in 2006.
At that time about 85 percent of highway diesel was ULSD.
According to EPA’s pump survey, the highway transition to ULSD was completed a few weeks ago with 100 percent of the fuel testing at or below 15 ppm.
Over the next few years, off-road diesel will be completing a similar transition.
"It is quite a remarkable feat that refiners have been able to reduce the sulfur content in diesel fuel by 97 percent," said Allen Schaeffer, the Executive Director of the Diesel Technology Forum. "The United States now officially has the cleanest on-road diesel fuel in the world."
Actually, Canada had completed the transition even earlier.
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