Source: Diesel Technology Forum

December 1st marked a significant milestone for the nation's transition to ultra-low sulfur diesel (ULSD) fuel as all highway diesel fuel in the United States complies with the landmark 15 parts per million (ppm) sulfur standard — a 97 percent reduction in sulfur content from diesel's 2006 levels.

The Dec. 1, 2010 deadline was mandated by the Environmental Protection Agency (EPA). However, according to EPA's pump survey, the highway transition to ULSD was actually completed a few weeks ago. Read EPA's pump survey results.

"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, executive director of the Diesel Technology Forum.

"This year has included several important environmental landmarks — the 40th anniversary of the Clean Air Act, the 10th anniversary of the National Clean Diesel Campaign, and now the official completion of the new ultra-low sulfur diesel transition."

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