U.S. Environmental Protection Agency

April 2001

Document Released for Public Information

"Evaluating Resting Loss and Diurnal Evaporative Emissions Using 
RTD Tests" 

Report Number   EPA420-R-01-018     (M6.EVP.001)
 
	The Office of Transportation and Air Quality, Assessment and 
Standards Division announces the release of "Evaluating Resting Loss 
and Diurnal Evaporative Emissions Using RTD Tests" for public 
information.  This document EPA420-R-01-018, also known as M6.EVP.001, 
is available at the MOBILE6 section of the OTAQ Web Site 
(http://www.epa.gov/otaq/m6.htm).

	This document reports both on the methodology used to analyze 
the data from real-time diurnal (RTD) tests on 270 vehicles and on the 
results obtained from those analyses.  The purpose of the analysis was 
to develop a model of the diurnal and resting loss emissions of the 
in-use fleet to be used in MOBILE6.

	This report was originally released (as a draft) in October 
1997, and then revised (and re-released) in July 1999.  This current 
version is the final revision of the July 1999 draft (of M6.EVP.001).  
This final revision incorporates suggestions and comments received 
from stakeholders during the 60-day review period and from peer 
reviewers.