A number of studies are available which attempts to predict the level of diesel exhaust particulate along the roadway resulting from the increased use of diesel engines as power plants for light- and heavy-duty vehicles. Among these are reports prepared by EPA, the Southwest Research Institute, General Motors Corp., Toyota Motor Co., and the Aerospace Corp. When trying to evaluate the results of these studies, the rate of diesel penetration into the market, vehicle emission factors, traffic density and meteorological conditions are among the variables encountered. This report attempts to establish a broader base of comparison among these studies than presently exists. This report consists of three basic sections: the first provides a brief description of the various studies; the second incorporates the standardizing assumptions in the modification procedure; and, the third compares the studies based on the changes made in section two.

Includes bibliographical references. Technical report. Cover title. "November 1979." "EPA-AA SDSB-79-31."