Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title APRAC-2 Air Pollution Dispersion Model.
Author Ludwig, Frank ; Obinata., Shun ;
CORP Author Environmental Protection Agency, San Francisco, Calif. Air and Hazardous Materials Div.
Year Published 1977
Report Number EPA/DF-78/007;
Stock Number PB-283 263
Additional Subjects Software ; Air pollution ; Computer programs ; Fortran ; Atmospheric diffusion ; Computerized simulation ; Carbon monoxide ; Emission ; Magnetic tapes ; APRAC-2 model ; Gaussian plume models ; DATA-100 computers
Library Call Number Additional Info Location Last
NTIS  PB-283 263 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation mag tape
The computer program for a completely revised version of the APRAC-1A diffusion model is presented and discussed. The new code uses EPA's emissions calculation methodology from Supplement No. 5 to AP-42. Gridded, and link by link emissions can be output for hydrocarbons, carbon monoxide or oxides of nitrogen. Diffusion calculations make use of a receptor-oriented Gaussian plume model. Local winds at the receptor can be used; they are interpolated from multiple wind inputs. Mixing heights may be calculated from sounding data, or input directly. Two local source models are available, one treating pollutant behavior in a street canyon, the other treats vehicle and pollutant effects at a signalized intersection. A small program is included for decoding Federal Highway Administration data tapes...Software Description: The program is written in the Fortran programming language for implementation on a DATA 100/78 computer. 300K bytes of core storage are required to operate the model.