10 June 1999

The Engine Manufacturers Association (EMA) called for the US Environmental Protection Agency (EPA) to modify its proposed Tier 2 rule seeking to control light-duty vehicle emissions through tighter standards and fuel changes. EMA maintains the proposed Tier 2 rule is not feasible for vehicles with diesel fueled engines. The proposal puts the viability of diesel fueled engine technology at risk, resulting in the potential loss of the many benefits that this technology can provide.

"Moderate changes to the proposed vehicle requirements and an increased focus on reducing the sulfur content of gasoline and diesel fuel would make EPA's proposal realistic for larger vehicles designed for work, and allow consumers to continue to use diesel engine technology," said Jed Mandel, EMA's Legal Counsel. "EPA should adopt rules that do not automatically preclude diesel engine technology as a means to address fuel economy needs, growing concerns about CO2 emissions and even air quality needs. With moderate and appropriate modifications to EPA's proposal, however, EPA can assure that it does not miss the opportunity to have low-NOx emitting, high performing, low CO2 diesel fueled engines available in the market," said Mandel. "Diesel fueled engine technology can remain a viable option without adverse emission impacts. And, with ultra-low sulfur diesel fuel, widespread NOx and particulate emission reductions can be achieved."

Mandel, who spoke on behalf of EMA's members who manufacture diesel engines that power pick-up trucks, sport-utility vehicles, other light-duty trucks and passenger cars, testified during the first day of Tier 2 hearings before the US Environmental Protection Agency (EPA) in Philadelphia. The Tier 2 Rule calls for reduced tailpipe emissions of nitrogen oxides and particulates from these light-duty vehicles.

EMA also noted that today's heavy-duty truck engines emit 90% less particulates and nearly 70% less NOx than in 1987. By the year 2004 heavy-duty diesel NOx emissions will also be reduced an additional 50% from current levels.

Source: EMA