A new study released by the Health Effects Institute (HEI) provides important
new insights on the advancements in clean diesel technology and ultra-low
sulfur diesel fuel, according to Allen Schaeffer, executive director of the
Diesel Technology Forum.
The peer-reviewed study entitled "HEI Research Report 166: Advanced
Collaborative Emissions Study (ACES) Subchronic Exposure Results: Biological
Responses in Rats and Mice and Assessment of Genotoxicity", was conducted by
the Health Effects Institute (HEI) in collaboration with the Coordinating
The goal of ACES is to test the emissions and health effects of the new
technology diesel engines to document the improvements that have been made and
to ensure that there are no unintended emissions from this new technology. The
study evaluated impacts from exposure to diesel exhaust emissions on laboratory
animals over various time intervals.
In their Commentary on the study the ACES Review Panel concluded: "Overall,
these results showed few biologic effects related to diesel exhaust exposure."
"As this new study illustrates, the 2007 compliant diesel technology provided
historic improvements in reducing particulate and nitrogen oxide emissions,"
"And the 2010 and newer diesel technology is even cleaner with near zero
emissions. In the past decade, emissions from heavy-duty diesel trucks and
buses have been reduced by 99 percent for nitrogen oxides (NOx) - an ozone
precursor - and 98 percent for particulate emissions which include black
carbon," Schaeffer said.
While this study is limited to highway diesel engines like those used in
commercial trucks and buses, virtually the same technologies (cleaner diesel
fuel and advanced engine and emissions controls) are being phased in for all
non-road engines and equipment used in construction, agriculture, mining and
"Getting to these near-zero levels of emissions is a result of the highly
integrated clean diesel system - cleaner ultra low sulfur diesel fuel, advanced
engine technologies and emissions control systems," Schaeffer said. "Not only
are the engines near zero emissions, they are also achieving important gains in
fuel efficiency of anywhere from two to 10 percent, bringing valuable savings
to owners and operators of new clean diesel engines."
HEI Study and EPA Black Carbon Report Highlight Importance of Clean Diesel
Schaeffer said the findings in the new HEI report coincide with the
Environmental Protection Agency's recently-released "Report to Congress on
Black Report", which stated: "The United States will achieve substantial (black
carbon) emissions reductions by 2030, largely due to controls on new mobile
diesel engines. Diesel retrofit programs for in-use mobile sources are a
valuable complement to new engine standards for reducing emissions."
"Today diesel engines are responsible for less than six percent of all
particulate emissions in the U.S.," Schaeffer said. "As clean diesel
technology continues to advance, these improvements will be even more
AplusA-online.de - Source: Environmental Protection