Final Emission Standards for 2004 and Later Model Year Highway Heavy-Duty Vehicles and Engines
From the document, "The U.S. Environmental Protection Agency (EPA) is issuing a final rule
for the first heavy-duty trucks and buses. In the first phase, EPA is
finalizing new diesel engine standards beginning in 2004 for all diesel
vehicles over 8,500 pounds. Additional diesel standards and test
procedures in this final rule will begin in 2007. Heavy-duty gasoline
engines will be required to meet new, more stringent standards starting
no later than the 2005 model year. The new standards require gasoline
trucks to be 78 percent cleaner and diesel trucks to be more than 40
percent cleaner than todays models." This is a US federal gov't document.
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