June 15, 1998

Document Released for Stakeholder Review and Comment

Update of Fleet Characterization Data for Use in MOBILE6
Document Number M6.FLT.002.

The Office of Mobile Sources, Assessment and Modeling Division,
announces the release of the document "Update of Fleet
Characterization Data for Use in MOBILE6" for stakeholder review
and comment.  This document (M6FLT002.pdf) is available at the
MOBILE6 section of the OMS Web Site
(http://www.epa.gov/omswww/models.htm).

Document M6.FLT.002 describes EPA's effort to characterize the
national vehicle fleet for use in developing emission factor for
various vehicle categoriesin MOBILE6.  This report is an updated
version of a report of the same name that was released for
stakeholder review in 1997.  At the time, stakeholders were 
informed that additional analysis would be performed and the
updated report would then be presented for a new stakeholder
review period.  This document represents one of two reports which
will describe the national fleet as it will be modeling in the
MOBILE6 model.The second report is expected to be ready for
stakeholder review in late June.

Comments on this report and its proposed use in MOBILE6 should be
sent to the attention of Tracie Jackson, Assessment and Modeling
Division.  Comments may be submitted electronically to
mobile@epamail.epa.gov, or by fax to (734)214-4939, or by mail to
"MOBILE6 Review Comments", US EPA Assessment and Modeling
Division,2000 Traverwood Drive, Ann Arbor MI 48105.  Electronic
submission of comments is preferred.  In your comments, please
note clearly the document that you are commenting on including
the report title and the code number listed. Please be sure to
include your name, address, affiliation, and any other pertinent
information.

This document is being released and posted on 06/15/98.  Comments
will be accepted for sixty (60) days, ending 08/14/98.  EPA will
then review and consider all comments received, and will provide
a summary of those comments and how we are responding to them in
the form of a follow-up document.

Thank you for your continuing interest in the development of
MOBILE6.

Sincerely,

Emission Inventory Group, Assessment and Modeling Division
US EPA Office of Mobile Sources