http://www.epa.gov/otaq/cert/dearmfr/cisd0707.pdf
EPA guidance on diesel emission technology is all WOMBAT with units like
g/mile and g/bhp-hr
On February 10,2000, EPA published the Tier 2 emission standards for
light-duty vehicles and trucks. These standards established common, "fuel
neutral" emission requirements for gasoline and diesel vehicles. They also
set common standards for all passenger cars, light trucks, and medium-duty
passenger vehicles. The Tier 2 standards allow emission averaging and
require new vehicles to meet an average NOx emission level of 0.07 grams per
mile (glmi). On January 18,2001, EPA published a rule setting stringent new
requirements for heavy-duty highway engines and vehicles starting in 2007.
Manufacturers plan to meet these requirements by optimizing engine designs
for low emissions and adding high-efficiency after treatment. The diesel
engine NOx standard, which is phased-in between model years 2007 and 2010,
is 0.20 grams per brake horsepower-hour (g/bhp-hr).
Michael Payne
1 Thorton Court
Potomac Falls VA 20165
USA
