U.S. Environmental Protection Agency
Office of Mobile Sources

                           P5UGREAD.TXT
  
February 24, 1995
(contact and file format information updated 12/17/98)

To All PART5 Model Users:

Re-release of PART5 Particulate Emission Factor Model

     The Office of Mobile Sources (OMS) has revised the
particulate emission factor model, PART5, which was originally
distributed in August 1994. This newest version of the PART5
model has been updated to correct the problems explained in the
"PART5 User Information Sheets #1 and 2", as well as a few other
problems discovered since then. The use of this revised version
of the PART5 model will not be required in PM10 inventories and
analyses until three months after the Federal Register announcement,
which is not scheduled until the summer. However, states can now
use this version of the model as the most recently approved
particulate model for PM10 inventories and analyses.

For complete info and the PART5 model itself, please refer to 
P5READ.DOC and PART5.ZIP, which should be available wherever you 
found the PART5 User Guide.

Questions about this document or the PART5 model can be
addressed to:
  
               PART5 User's Guide -- Comments
               Assessment and Modeling Division
               2000 Traverwood Drive
               Ann Arbor, MI  48105
  
               Fax:  (734) 214-4368
  

User Guide Files:

part5ug.pdf   Main body of User Guide
part5uga.pdf  User Guide Appendix 

The free Acrobat Reader for viewing/printing Adobe Portable 
Document Format (PDF) files is available from the Adobe web 
site at http://www.adobe.com.