TITLE
RECEPTOR MODELING OF VOLATILE HYDROCARBONS MEASURED IN THE 1990
ATLANTA OZONE PRECURSOR STUDY

AUTHOR(S)
Charles W. Lewis, Teri L. Conner, Robert K. Stevens,
John F. Collins and Ronald C. Henry

PERFORMING ORGANIZATION NAME AND ADDRESS
Atmospheric Research and Exposure Assessment Lab.   U.S.
Environmental Protection Agency
Research Triangle Park, NC 27711; and
University of Southern California
Los Angeles, CA 90089

SPONSORING AGENCY NAME AND ADDRESS
Atmospheric Research and Exposure Assessment Lab.
Office of Research and Development
U.S. Environmental Protection Agency
Research Triangle Park, NC 27711

ABSTRACT
A very large data base of ambient non-methane hydrocarbons (NMHC),
measured in Atlanta during summer 1990, is now available.   The
data base includes hourly measured ambient concentrations of C2 -
C10 species at six surface sites during July and August.  Chemical
Mass Balance (CMB) receptor modeling is used to determine the
individual contributions of several source categories to measured
total NMHC at one of the central city sites (Georgia Institute of
Technology).  A novel feature of the modeling is the use of source
profiles derived from the ambient data itself through the use of
GRACE (Graphical Ratio Analysis for Composition Estimates) and
SAFER (Source Apportionment by Factors with Explicit Restriction)
methodologies.  For the purpose of emissions inventory validation
the CMB results are compared to the 1990 summertime Atlanta
emissions inventory prepared by the Georgia Department of Natural
Resources.