Ultra-low sulfur diesel (ULSD) will begin replacing
conventional diesel fuel starting in 2006. The new fuel will contain
97% less sulfur than conventional diesel—sulfur will be reduced
from 500 parts per million (ppm) to 15 ppm.
ULSD
is cleaner-burning, producing less particulate emissions in both
older and new engines.
It will also allow the use of improved exhaust treatment
devices to reduce emissions of particulates and smog-forming nitrogen
oxides (NOx). These devices can be "poisoned" by the sulfur
in conventional diesel fuel.
ULSD
is cleaner-burning, producing less particulate emissions in both
older and new engines.