Record Display for the EPA National Library Catalog


Main Title APRAC-3/MOBILE 1 Emissions and Diffusion Modeling Package: User's Manual.
Author Simmon, P. B. ; Patterson, R. M. ; Ludwig, F. L. ; Jones, L. B. ;
CORP Author SRI International, Menlo Park, CA.;Environmental Protection Agency, San Francisco, CA. Region IX.
Year Published 1981
Report Number EPA-68-02-2548; SRI-8855; EPA-909-9-81-002;
Stock Number PB82-103763
Additional Subjects Mathematical models ; Air pollution ; Manuals ; Exhaust emissions ; Forecasting ; Diffusion ; Computer programming ; Computer programs ; MOBILE 1 model ; Emission factors
Library Call Number Additional Info Location Last
NTIS  PB82-103763 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 333p
Instructions on the use and applicability of the APRAC-3/MOBILE1 emissions and diffusion model are presented in this manual. The previous version of the model, APRAC-2, completely revised the methodology of the original model, APRAC-1A. The latest version of the model remains basically the same as APRAC-2 with the exception of two important modifications. First, the emission factor computation methodology has been revised to reflect the EPA's latest update, and the portion of the code that performs those computations has been separated from the model's emission rate and diffustion modules to facilitate incorporation of future emission factor methodology updates. The second modification to the model will increase computation efficiency by automatically treating traffic links in the primary network with low vehicle miles of travel (VMT) as area sources. This will allow the remaining primary link file to fit into core storage rather than incurring the numerous and expensive input/output operations necessary when the primary traffic file is large.