Abstract:

Update of Hot Soak Emissions Analysis

   April 2001
 
   EPA Publication Number (EPA 420-R-01-026)
   
   MOBILE6 Report Number (M6.EVP.004)

   Available at: (http://www.epa.gov/otaq/m6.htm)

   ARCADIS Geraghty & Miller, Inc.
   for
   U.S. Environmental Protection Agency
   Office of Transportation and Air Quality 
   Assessment and Standards Division

"Hot soak" emissions are evaporative hydrocarbon emissions from
vehicles in the hour after a trip's end. This document
incorporates the findings of two studies conducted by Automotive
Testing Laboratories, one on behalf of EPA., the other for
Oil/Auto Air Quality Improvement Research Program (AQIRP) to
develops hot soak emission estimates at low RVP values.  These
values are used in the official EPA highway vehicle emission
factor model, MOBILE6.