Clean Diesel 101

New cleaner-burning ultra-low sulfur diesel fuel is refined to contain 
97 percent less sulfur than regular diesel. That’s 15 parts per 
million instead of the 250 - 500 parts per million in regular diesel. 
The introduction of cleaner diesel fuel is the first step toward 
adding advanced after-treatment technologies. California shifted all 
its diesel fuel to ultra-low sulfur in 2006. The deadline for the rest 
of the country to introduce ultra-low sulfur diesel fuel is December 
1, 2010.