U.S. Environmental Protection Agency

November 2001

Document Released for Public Information

"Final Determination of Hot Running Emissions from FTP Bag Emissions"

Report Number   EPA420-R-01-059     (M6.STE.002)
 
	The Office of Transportation and Air Quality, Assessment and 
Standards Division announces the release of "Final Determination of Hot Running
Emissions from FTP Bag Emissions" for public information.  This document 
EPA420-R-01-059, also known as M6.STE.002, is available at the MOBILE6 
section of the OTAQ Web Site (http://www.epa.gov/otaq/m6.htm). 

	This document describes our efforts to develop a simple model for
estimating hot running 505 (HR505) emissions from FTP data. The
HR505 is an extra exhaust emissions "bag" performed immediately
following the third "bag" of the standard FTP. This new "bag" is
a duplicate in terms of speed/time to the first and third "bags".
The only difference between the "bags" is the HR505 does not
contain an engine start. The HR505 was developed to allow the
separation of the emission effects of vehicle start with the
effects of hot running operation.
 

	This report was originally released (as a draft) on May, 1999 
under the title, "The Determination of Hot Running Emissions from FTP Bag 
Emissions".  It was subsequently revised in November, 2001, 
and the November, 2001 is now the final version.  This final revision 
incorporates suggestions and comments received from stakeholders during the
60-day review period and from peer reviewers.