NATURAL GAS SCHOOL BUS EMISSIONS EXCEED LOW-EMITTING DIESEL
BUSES IN RESEARCH REPORTED TO SOCIETY OF AUTOMOTIVE ENGINEERS
CONFERENCE DETROIT, Mich. (November 18, 2002) - Exhaust
emissions from natural gas school buses contain higher levels of
air pollutants and toxic air contaminants than those in school
buses powered by advanced-technology, low-emitting diesel
engines. That is the chief finding by an independent research
laboratory under contract to International Truck and Engine
Corporation, presented to the Society of Automotive Engineers
conference. The research compares emissions from a popular model
natural gas bus with emissions from diesel school "We now have a
reliable basis for comparing the current relative toxicity of
natural gas and diesel engine exhaust," said Dr. Charles A.
Lapin, a toxicologist and co-author of a forthcoming SAE paper
on the research. "The study shows that low-emitting diesel
technology clearly has clean-air advantages over natural gas
when it comes to school buses." Internati