1.  TITLE:
Hardcopy:  Motor Vehicle-Related Air Toxics Study

Data files: AIRTOX01.ZIP  body of report, WordPerfect 5.1 files
            AIRTOX02.ZIP  text of appendices, WordPerfect 5.1 files
            AIRTOX03.ZIP  appendix B Lotus .WK1 files (See Note Below!)
            AIRTOX04.ZIP  appendix G Lotus .WK1 files
            AIRTOXPR.ZIP  peer review comments on air toxics study

2.  IDENTIFICATION NUMBER:
EPA Publication Number EPA 420-R-93-005

3.  ABSTRACT:
     
The motor vehicle-related air toxics study is the result of the 
first directive of Section 202 (l) of the Clean Air Act, which 
directed EPA to complete a study by May 15, 1992 of the need for, 
and feasibility of, controlling emissions of toxic air pollutants 
which are unregulated under this Act and associated with motor 
vehicles and motor vehicle fuels.  The study was to focus on 
those categories of emissions that pose the greatest risk to 
human health or about which significant uncertainties remain, 
including emissions of benzene, formaldehyde, and 1,3-butadiene.  
Specific pollutants or pollutant categories which are discussed 
in this report include benzene, formaldehyde, 1,3-butadiene, 
acetaldehyde, diesel particulate, gasoline particulate, gasoline 
vapors as well as selected metals and motor vehicle-related 
pollutants identified in Title III of the Clean Air Act 
Amendments.  The study focuses on carcinogenic risk, which is the 
major impact of the emissions (benzene, 1,3-butadiene, and 
formaldehyde) specifically mentioned in Section 202 (l), although 
discussions of non-cancer effects for these and other pollutants 
are also included.

Also provided are peer reviews of the Motor Vehicle-Related Air 
Toxics Study.  The five independent peer reviewers were Tadeusz 
E. Kliendienst, Andrew Sivak, Thomas H. Stock, Jaroslav J. 
Vostal, and Clifford P. Weisel.  

4.  PURPOSE:  See above

5.  ORIGINATOR:

EPA National Vehicle and Fuel Emissions Laboratory
2565 Plymouth Road
Ann Arbor, MI   48105

(313)741-7827

6.  PUBLICATION DATE:  April, 1993

7.  ACCESS CONSTRAINTS:

Appendix D is not available in electronic form.  Public comments 
in Appendix I, from Arco Chemical Co., California EPA, Environ 
Corporation, Konheim and Ketcham, and Zephyr Consulting are also 
not available electronically.  If you wish to obtain these parts 
of the study, contact Rich Cook at (313) 741-7827.

8.  AVAILABILITY:

a.  Distributor:
     Data file:  The United States Environmental Protection Agency
                     Office of Mobile Sources

b.  Order Process:
     Harcopy of the study for a fee from NTIS:

     NTIS
     5285 Port Royal Road
     Springfield, VA   22161

     Order number:  PB93 182590

c.  Technical Prerequisites:
    PKUNZIP version 2.04g to unZIP (uncompress) the .ZIP files.

    ** IMPORTANT NOTE **

To properly extract all the files from the AIRTOX03.ZIP file, 
you must use the command: 

          PKUNZIP -d AIRTOX03

The -d option creates separate subdirectories for the files of 
Appendix B, which will be necessary since the filenames of
worksheets in some parts of Appendix B are the same as in other 
parts of this appendix.