June 17, 1998
                                
      Document Released for Stakeholder Review and Comment
                                
       "Emission Control Technology Distribution Report"
                                
                    Report Number M6.FLT.008
                                
The Office of Mobile Sources, Assessment and Modeling Division,
announces the release of "Emission Control Technology
Distribution Report" for stakeholder review and comment. This
document (M6FLT008.PDF) is available at the MOBILE6 section of
the OMS Web Site(http://www.epa.gov/omswww/models.htm).

ABSTRACT: 

The EPA mobile source inventory model MOBILE5, estimates
emissions by emissions control technology type and vehicle type. 
The technology groupings and their market penetration are
periodically reviewed and updated to reflect new regulatory
initiatives and new technological developments.  This report
provides a review of historical and future technologies and
suggests appropriate groupings for emission factor analysis. 
Forecasts of the number of vehicles (light duty vehicles, light
duty trucks, and heavy-duty trucks) in each of these technology
groupings were made for model years through to the 2020 model
year.  These estimates for recent model years are based on CAFE
and certification data, while forecasts of future distributions
were derived from the expert opinion of manufacturers.

Comments on this report and its proposed use in MOBILE6 should be
sent to the attention of Larry Landman. Comments may be submitted
electronically to mobile@epa.gov, or by fax to (734) 214-4939, or
by mail to MOBILE6 Review Comments, USEPA 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 June 17th. Comments
will be accepted for sixty (60) days, ending August 15th. EPA
will then review and consider all comments received, and will
provide a summary of those comments and how we are responding to
them.

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